Euston to MKC is 40-odd miles and it applies there.
That is the difficulty, but freeing up of the HEx paths if it becomes non-viable once Crossrail opens (ha!) would be a start.
Ahh OK we are getting somewhere!
I am a Thames Valley traveller, not commuter.
At peak times, I use a Thames Valley fast service to London and do not change at Reading, as it is only slightly slower and I get a seat. 12-car 387s are interesting in short platforms! Off peak times, I always change at Reading as the onward journey is very slow (although this should change with Crossrail) and the Inter-City services are lightly loaded at the down end.
Coming back I go for the first fast train and do as 99% of travellers to get to Reading without reading the boards. GWR will have serious issues with non-stoppers because of this! Off peak I get a coach to myself, peak times I jump on last minute & stand. Hell, why would me standing for 20 mins in the vestibule destroy a 1-2 hour journey for someone? I can then catch my local train. I would catch the Thames Valley direct fast, but they are seriously loaded, worse than Inter-Cities, which is why some are 12-cars and you get the walk of shame at Maidenhead getting out of the rear 4-car unit!
Travelling west, I go up to Reading to change as too few trains stop at Didcot. Remove those Reading calls and I would just drive and GWR know that.
All these complaints I read on here about train formations are a bit ridiculous and written by distant train 'experts'. GWR seem to be masters of sizing trains for demand, well learnt a few years back.
So what other 'local' fast journeys would you ban? Crewe - Liverpool?, York-Newcastle? Preston - Lancaster? Come on, trains are to move people and not to create a privileged long traveller class!