You seem to have missed the bit where I said that if East West went via Hitchin - which would inevitably mean a major revamp of the station - then ECML operators might very well favour it over Stevenage as a place to stop, which was of course the case before Stevenage new town was built. With the profusion of Thameslink trains planned for the future it's not as if people travelling to/from Stevenage would have long to wait for a connection. Thus serving 150,000 people, whereas St Neots would serve, well, St Neots.
Whilst you're quite correct about the historical arrangements, I sincerely doubt mainline express operators would omit stops at Stevenage. One only has to look across to the WCML to see exactly what will happen. Remind me, how many Virgin West Coast services stop at Bletchley?
The problem with things as they are likely to end up is that they change a 3 leg trip (i.e. Watford - Bletchley - St Neots - Peterborough) into a 5 leg trip (i.e. Watford - Milton Keynes - Bletchley - Hitchin - Stevenage - Peterborough), and even that's arguably too many. Yes, you can reduce it back down to a 3 leg trip on the slower services, but you'll be on the slow stopping services which will take a lot longer to cover the distance, making things uncompetitive with going via London, or worse, by road.
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