I mentioned Birmingham in reply because the Cambridge-Birmingham time had already been mentioned in the discussion. But from Cambridge and Oxford I'm thinking more of connectivity between Oxford or Cambridge and the North West, for example Manchester. Before the Varsity line closed the main route from Oxford or Cambridge to the North West was via Bletchley.
This is a very strong argument for not stopping, how does it work at, for example, Lille Flandres?
As has been said many times before, a stop on HS2 anywhere between Euston and Birmingham Interchange needs all trains to stop, or alternatively fewer trains in the system. The former will cost 7-8 minutes on the journey time (quite significant in the scheme of things), the latter means a reduction in capacity. Both will make the business case for HS2 worse -and considerably so.
This is a very strong argument for not stopping, how does it work at, for example, Lille Flandres?