The curve is fine, just the encounters could offer some challenge at times. Even if its a few added mobs if the group has higher levels.
Nah ... easier combat is your reward (or curse) for doing side content and become
Harder, Better, Faster, Stronger ...
There will be difficiulty settings to adjust this in full release.

That should be suifficient imho.

always liked that song

Well, if you look at it that way, you are right.
personally though i would like a little more challenge at times. Even going to the grove at level 1 is not really difficult. In that case i guess that is wanted though since its important story progress you cannot really avoid.
But BG3 (or DnD) has so many utility spells and options like fog cloud etc. Those can be pretty cool to use. But i have never really expirienced a need for those since you can win most fights by just doing dmg.
Take the gith for example.
my first fight against them was like OMG i can never beat them. I tried using all manner of items and spells..sadly..the only thing that worked was killing them as fast as possible. they succeed most of their saves and if you get one trough the next breaks your concentration.
thats a little sad sometimes. For me the most effective thing is still blasting everything^^
now, i can kill them at level 3 with relative ease.
All in all that is a personal preferrence i guess. and if we get something like a hardmode everyone who wants, can have more difficulty. (just hope its not just more hp, dmg , even better saves, thats just boring :))