@Rag, I simply quoted the last
2 people who brought up numbers, which happened to be you AND someone else. And as you were the most frequent poster in that discussion, you were thus statistically the most likely to be quoted.
The problem here is that game would need to be litteraly redone from scratch ...
And im only talking about stats and scores ... if we also include lore, then we are completely screwed.
Take Halsin for example
(problem with lore is that he would need to be around level 20 ... wich kinda means able to wipe out litteraly everyone of whole Act 1 at once in single turn.

)
But just stats and scores ... [...]
I actually disagree with the opinions that NPCs and monsters
need to have PC-like stats in order to match RAW. That's the ~least important part of D&D, there are so many different monsters in 5e (in addition to creating your own); just think of a BG3 "intellect devourer" as a "minor intellect nibbler." Obviously some monsters should remain similar (dragons and mind flayers should be pretty powerful), and homebrew monsters can be done poorly (decreasing goblin AC and increasing HP results in nerfs to ST spells), but there's nothing inherently wrong with creating your own or modifying monsters
if done well.
Much more important is the matching of 5e mechanics - shove, concentration, surface/grenades, healing, items, spells, etc. Again, homebrew mechanics changes
can be done correctly while preserving balance...but again it's important to consider what effects such changes will have on other aspects of the game. And changing a single mechanic will have a vastly greater effect on gameplay than changing a single monster.
tl;dr: I don't think Larian needs to match enemy stats to the 5e Monster Manual when creating a '5e RAW' mode, which will greatly decrease the amount of work required. Gameplay mechanics are more important than NPC stats.