"That's a big ship"
"Not as big as her Captain."
--- McCoy and Scotty at the end of Star Trek VI
So, if the Excelsior Class is a big ship (confirmed as 466 meters in length), would that make the Shepard Class 40 years earlier, a HUGE ship, and a Crossfield Class (again 40 years earlier) at 750 meters, would be a GINORMOUS ship?
Or can we just finally accept, that this is NOT "Prime". Not the same Prime we grew up with as TOS, TNG etc. Alternate Prime possibly, (neither Primeverse, or Kelvinverse). I mean, if they had ships flying around 30-40 years earlier than the Excelsior Class, that were larger, almost double in length, McCoy wouldn't be "in awe" of the BIG Excelsior Class.