...Then again, there only ever was one "classic TOS" starship design in evidence. Quite possibly no others survived outside the background logistics side of things, having been refitted with bits and pieces that gave them the DSC appearance (box nacelles etc). And this would include those "classic TOS" ships glimpsed on TOS movie computer screens, as we already learned such screens show outdated, pre-refit views of such ships (or at least they did that exact thing with Kirk's ship).
Having the "classic TOS" style actually be a 2220s-30s thing (such as in fan assumptions before the 2245 launch date for NCC-1701 started getting pushed), its representatives all gone by the 2270s and most either lost or converted by the 2250s already, would be perfectly consistent with everything we know.
Now, mixing DSC and TOS (and ENT) Klingon designs... We at least got the cleave ship alongside the D7 shape of things to come, although I'd argue it to be the one Klingon design without a right to survive, it being the equivalent of the ram monitor in the early days of steam, and actually a poor use of the new cloaking capability.
Timo Saloniemi
Having the "classic TOS" style actually be a 2220s-30s thing (such as in fan assumptions before the 2245 launch date for NCC-1701 started getting pushed), its representatives all gone by the 2270s and most either lost or converted by the 2250s already, would be perfectly consistent with everything we know.
Now, mixing DSC and TOS (and ENT) Klingon designs... We at least got the cleave ship alongside the D7 shape of things to come, although I'd argue it to be the one Klingon design without a right to survive, it being the equivalent of the ram monitor in the early days of steam, and actually a poor use of the new cloaking capability.
Timo Saloniemi