Yes, but from experience a good number would like to break their journey at somewhere like Leicester or Nottingham which require travelling to/from St PancrasFor the majority of normal travellers from York heading to London they would use the ECML towards Kings Cross rather than the weekend daily EMT service due to journey time.
True but you don't need to take a direct train - it's a mapped route.In the current world, that’s valid by the through train rule.
There is a consultation
https://www.smartsurvey.co.uk/s/EasierFaresConsultation
"Fares designed so that it is unnecessary to buy a ‘split-ticket’ in order to get the cheapest deal. At present, there are occasions when it is cheaper, when making a journey from A to C, to buy two or more separate tickets e.g. two tickets (A-B and B-C) may be cheaper than one ticket (A-C).
If this were changed those who currently buy split tickets may pay a little more whereas those who currently buy through tickets may pay a little less."
A 'little more' is obviously a blatant lie, as in the example of £30 + £30 and £100, the median fare would be £80, which is not 'a little', and moreover it is hard to see how you could eliminate split ticketing without having punitive regulations based on the start and end of a journey, as some fares are presumably always going to be much cheaper due to regional subsidies etc. And it doesn't seem likely that they would drastically cut fares on fat cat high-priced lines.
Clearly the solution is to reduce the cost of the through tickets such that the split tickets are no longer so compelling, however this does not seem likely.
Could they not simply do what OwlMan's spreadsheet says, and write:
"London: KGX/MOG/OLD/STP/LST"
The three-letter codes are sensible, and easily searchable.