Isn't the Vesta only slightly smaller than the Sovereign-class? That'd probably eliminate it from being used as an escort.
Plus Cryptic will usually ignore the intended role of the vessel anyway. Hence the Nebula-class as a science ship in-game.
I don't know, I always figured the Nebula class for a science vessel, like an up-to-date Miranda class.
Anyhoo, has anyone seen the servers today?! They're packed! I was in a LONG queue before I ever got in to play, and even then I was only in 15 minutes before I got bumped. The STO forums just went down due to all of the activity, too! It's a mixed blessing, but yay, STO is busy!