Thanks, but no I'm not assuming a connection will be held, that really would be expecting too much. My concern is that those who make these proposals often don't experience the realities of when they fail. I had a classic example at Eastleigh when a trespass incident caused the line to be shut for over 3 hours. This meant that the last peak period train ex-London arrived into Eastleigh just before 11pm, into a platform adjacent to a Portsmouth train. Around 40 people wanted to catch this Portsmouth train, but it waited for almost a full minute with its doors locked, and then disappeared into the night with intending passengers left stranded. Now nobody could possibly argue that it had to go without waiting for one extra minute, at this time of late evening for pathing reasons. The fact was that nobody at Eastleigh station was aware of the plight of these passengers.
Some of us found the most senior person at the station to ask what we were supposed to do, and he openly admitted to us that he'd just come on shift and was unaware of the line having been closed for such a long period. A bus eventually arrived, but it was only going as far as Fareham, as I found out when I had to give the driver directions when he got lost.
Does this all sound crazy? Yes it certainly is, but those who make these plans are all too often simply not aware of how these things can go wrong, and for the most ridiculous and unnecessary of reasons. I mean, how could someone in charge at Eastleigh simply not know that the station he was in charge of, had received no trains for such a long period just before he got there? Clearly there there was no handover, or if there was then it was seriously lacking in value. So yes, I understand the intentions of these "connections", I just despair when those who plan them, are often so unaware of what happens in practice. Yes they work, often for most of the time, but there is also too much scope for spectacular failure, and I strongly suspect that similar failures will happen with rail-flight "connections".