Just entertaining the T&W integration debate for a little longer ...
Having looked at the network a bit more and indeed travelled on it, the 'deregulation destroyed integration' refrain really is a red herring.
I have looked at the network as it was before, during and after the Metro build and introduction, and indeed travelled on it a plenty in that era.
I think you are missing the full understanding of integration - it is not just about the interaction of bus stops and railway stations; it is about integration of timetables, of fares, of finances so the economies of concentration of passengers on a particular mode creating financial surplus can cross finance the weaker parts of the network and give them a better standard of service than would otherwise be the case with the same pot. It can also mean improving environmental factors not directly due to the profit and loss account of the public transport provision element.
In the case of T&W, some of the business case was relieving the stress of heavy vehicles (particularly buses, and trains above) on the High Level bridge (which was going to require major work), and also partly to reduce the impact of the quantity of buses in Newcastle City Centre streets and in particular the elimination without replacement of the busy, outdated, dangerous bus station situated in Worswick Street. (the operation of which had to be seen to be believed, and is inconceivable in today's environment).
Bus deregulation did destroy this integration - bus services were extended from Metro stations into central Newcastle, through fares between bus services and Metro services all but disappeared, the Metro had financial difficulties and has run a poverty stricken system more reliant on subsidies, central Newcastle had to accommodate all these terminating buses again and money spent on the High Level bridge / other bridges to cope with the load.
On the continent if the rail mode has a stop spacing of about 1km or above (big metro), then it's common to have a stop-every-400m parallel mode, be it bus or tram. The T&W metro is a stop-every-km big metro, and most of the alignment does not parallel roads, so all segments of bus routes have every reason to exist. All deregulation allowed was for, e.g, route segments either side of Heworth to be operationally joined up, oh the humanity!
It was not been a case of merely joining up route segments either side of Heworth, the services feeding Heworth were greater than those between Heworth and Gateshead, at least by the direct road. As I understand it, the collapse of integrated fares meant that passengers had to take longer 'through' journeys around other suburbs or suffer financial penalty by changing modes. The finances of the Metro were greatly damaged by this, and no doubt the bus riding numbers dropped too.
Operations like the T&W metro should be sized so that (morning peak inbound) trains approaching Gateshead should be carrying critical load, and Gateshead alighters get replaced by foot passengers towards Newcastle. Enforced bus transferers would drive the critical load between Gateshead and Newcastle, increase rolling stock requirements and lead to trains being underutilised coming into Gateshead.
I am not sure that this principle is quite correct, otherwise a train leaving Bournemouth for London should only be able to collect sufficient passengers at Southampton to replace the relatively few that get off there? I don't think that principle works in practice quite like that anywhere does it? I think that an Achilles heel of the integration scheme was that effectively at Gateshead the transferring bus passengers would be crush loaded, standing, onto the Metro for a few stops. [This was not an issue with the original (pre-deregulation/pre Sunderland extension) at Heworth, because the majority of trains towards Newcastle started there]. This may well have been fine for younger, more sprightly, passengers, but not so good for the older and disabled. Very few of the passengers would have had to endure such conditions on the pre-integration bus system. The issues that London Transport had with the concept of standee buses ten years earlier had not been learnt - presumably the architects of the scheme thought that such loading is accepted on the London tube so would be accepted on Tyneside? There needed to be Gateshead terminating/starting trains at main travelling periods.
Enforced bus transfers did drive the critical (crush) load between Gateshead and Newcastle, but Gateshead and Newcastle (in particular, but also the other duplicating routes to the Metro) did drive the critical number of buses required on the pre-integration routes and it was reduction of these (both cost and road/kerbside occupancy) which assisted the financial case for the Metro to be built at all.
Looking at stations like Heworth Pelaw, it seems to me that T&W designers in the 80s over-relied on bus transfer and park & ride passengers, and completely neglected to create urban walking environments that attracted foot passengers. I would go as far as saying around half of T&W stations are openly hostile to foot passengers.
That sounds quite subjective - I doubt there was the money or political will to create urban walking environments that attracted foot passengers, . The system was designed in the 70s and mostly opened in the early 80s, much of it on existing railway lines, and between Gateshead and Heworth in an alignment much wider of rail track, and an industrial corridor (at the time of designing). Not everything could be done perfectly, and if too much had been demanded then the system would not have been built at all. The art of the possible.
It was one place in provincial Britain where a really good go was made at Bus/rail integration. Of course mistakes were made, but bus deregulation (for good and for bad) did destroy this integration.