If by mod you mean tweak then yeah I think that makes sense. If you mean mod as in to leave balancing to modders I can't really back you up. BG3 has no GM and is relentlessly played on a battle map. Some abilities in D&D don't translate well to BG3 while others translate extremely well. Also 5E from the players guide is a bit "first draft" but using all the supplemental content is impractical so some choice adjustments make sense. Tieflings received substantial buffs from Mordenkainen and Sword Coast Adventurers after all.
After what I've seen so far from the devs? No, I mean 'mod'. As in, let us decide.
I mean I want to argue with this but Larian aren't making it particularly easy for me. If Larian can't demonstrate a better understanding of the games balance than they have thus far then it might be better to change as little as possible so as to make modders lives easier. That said they'll have to make
some changes to get the interface working so implementing a few extra tweaks via adding existing optional rules and splat is probably still worthwhile.
