Winslow has been built for the size of the settlement it is projected to become, IMO.
Otherwise, the only argument I can see for over-specifying is it being 100mph not 90 and that's silver-plating at best. It isn't electrified, and it's conventional colour-light signalling not ETCS. It's double track throughout (required for the intended final service level) with 1 loop at Claydon (plus the reception siding for the future HS2 IMD), which is part of it's freight role. W12 is required for the freight clearances, and the RA is RA8 from Bicester to Bletchley, so again pretty much the bare minimum for heavy aggregates freight flows.