All season 1 shows is that the Discoprise design somehow exists in-universe. Even on the zoomed in shots used for the S1 Blu-ray menus, a registry number isn't visible. And yes, there are some Discovery shuttles. But, using "150 year old" designs as new supports the theory more than detracts from it...Also Picard Season 1 used the DSC redesign.
It allows for TOS and DISCOVERY/SNW to have equal status without one overwriting the other. It seems like a fair compromise. Plus TOS is too integrated into Berman-era shows, so destabilizing it destabilizes them as well.Why is this the best?
I know you don't care about canon/continuity, but a significant segment of the fanbase does. In trying to sell NuTrek skeptics on giving season 3 a fresh shot, Robert Meyer Burnett heavily implied we'd see a TOS Connie design as a selling point.