I have never understood this line of reasoning. We already have a top tier Excelsior, which is barely any newer than the Constitution. We also have a top tier B'rel, which is arguably an even older ship. Both are iconic designs, and it in in their interests to let fans use the Connie in endgame.
Yeah, i didn't quite get that logic too.
I mean, if STO where at least a bit to be taken serious, ships like the Excelsior, Galor or D'Kora wouldn't be that strong (firepower wise). But since STO is just a Star Trek themepark i see no good reason NOT to release a Endgame Constitution.
They should just make sure it doesn't get more firepower than a Sovereign, Galaxy, Ambassador or even Excelsior. Maybe as a science/engineering cruiser or something like that, but in no way as a Firepower monster like the Excelsior or a escort, that would really be rediculus.
On the other hand i could imagine giving it a BOFF & Console Layout like the Fleet Heavy Cruiser Retrofit.