The shown level is probably some remnant of the Divinity engine. It doesn't correlate with monster stats from what I've seen. But seeing every goblin be level 2 or 3 undermines character progression.
The power level of creatures absolutely must make sense in the context of Forgotten Realms. No up or downscaling anything. Archdruids need to be very powerful. If you want players to be able to murder them they need to fight dirty of face them in a weakened state.
BG3 needs similar bestiary that Pillars of Eternity, Solasta and many other RPGs have. Learn more details about creatures by trial and error, with Investigation skill or from reading books. It is now the expectation and BG3 has the biggest budget so missing this feature would look rather strange. PC's having omnipotent knowledge makes the world feel less real and threatening.
And... having seen the enemy stats, most seem to have a rather even spread of mid-rangey attributes at worst, like Wis 12 on some random ogre or humanoid. Would be nice to find some low stats like Wis 6 or 8 to exploit sometimes and slam down a Hold Person that actually works.