TPE are changing from a long distance commuter network to an intercity network. They need trains that provide an intercity image - trains with long carriages and doors at the ends of the vehicles do just that
The new franchise will pick up responsibility for local stations like Slatihwaite/ Marsden/ Greenfield etc, so if anything TPE is changing to more of a "local" provider.
That said, there does seem to be a Forum obsession with clear cut distinctions between "Intercity" and "non-Intercity" (see also "outer suburban" vs "long distance etc) - a lot of routes are a muddle of different markets.
The headline Manchester Airport - Newcastle service is a lightly loaded train from the Airport to Piccadilly that needs to cater for passengers with a lot of luggage... then a busy commuter route with high turnover of passengers from Piccadilly to York (which needs wider doors to cope with station dwell times)... then relatively long distance north of York (albeit it's the slowest train on the line stopping at Thirsk/ Northallterton/ Chester le Street).
So any train has to be a compromise - end doors will be nicer for the minority of passengers doing the longer journeys but they'll be outnumbered as the service passes through Yorkshire.
A four coach 185 would have been a reasonable compromise - their doors are more like "quarter and three quarter" AFAICR - I think dwell times at places like Piccadilly's 13/14 are going to struggle with "end door" carriages.
a medium size TOC choosing to have 4 different types of stock from 3 different manufacturers? Crazy
Agreed.
First/MTR are replacing almost two hundred EMUs of four types (455/ 456/ 458/ 700) with one mega-fleet of units to keep costs down/ improve flexibility etc.
Greater Anglia are replacing around eight fleets with two or three (depending on how pedantic people want to be about subfleets etc).
But First are going to have 185s/ 397s/ 802s plus local hauled on a significantly smaller franchise?
Add in the "it's cheaper to get new trains than to retain old ones" argument against the idea of retaining 185s for Manchester - Leeds services... it looks like a mess.