Again, keeping this as a shuttle completely ignores stakeholder and passenger complaints. Especially, about lack of connectivity to Leeds.
The passenger complaints are I think more about reliability, Seamer (just outside Scarborough) is my local station, and as a fairly regular traveller passenger comments/complaints hinge around reliability. Is the train going to turn up at all? (During most of 2018/9 and even post covid this is a valid concern) and will it arrive at my destination even remotely on time. Whilst it would be nice to have through services most of the other passenger that I am on 'aquaintance' terms with feel the same way as I do, number 1 priority is reliability, and the full timetable means that meltdowns are frequent. So given a choice between a through service that has an 20% chance of not delivering or a shuttle that runs reliably and to time everyone will opt for the shuttle. Commuting to Leeds is reduced anyway, and will probably never recover to pre-covid levels, and there is a good regular service between York and Leeds, so you are never waiting long, and Leeds is just one destination of many that people from Scarborough use.
During the various periods of TPE meltdown there have been 3 hour gaps in the timetable at Scarborough, and days where nearly half the trains are cancelled. If you try to run a railway in that way people will stop using it. Now people are used to the shuttle, it runs reliably (apart from weekends, but thats a different issue) and you can plan a journey. It also addresses some operational issues at York, as Scarborough trains have to use Plats 3,4 or 5 when coming or going from places west, so ECML problems can also have a big impact. The shuttle uses Plat 2 or 4 and is unaffected by ECML issues.
So going back to a point which has been made before, its very difficult to run services from everywhere to everywhere. One less TPE service through the York - Manchester route seems to make a massive improvement in overall TPE north reliability, and to be honest if one eastern leg is going to become a shuttle Scarborough is the obvious choice. Yes its my local route, and I want good connectivity to London and Manchester for my work, so through trains are nice, but without relability it is useless. I can factor in 15 mins ish to change at York into my plans. Turning up at the station and finding my train to or from Scarborough is cancelled leaving me an hour (or more) late is unacceptable to me, and this seems to be the choice. When the route upgrade is finished it might then be possible to restore the through service, but that is probably 10 years off, these are 'Now' problems