I don't think I've seen a valid argument as to why the cheese is good for the game from the people defending it or being neutral to it, beyond "lolz" and "doesn't bother me". All other considerations be damned.
Well, I have read many times that barrelmancy, aoe surface spam, height and backstab advantage would add extra layers of complexity to the game. Then there were many people painstakingly pointing out that this '+1 extra layer to complexity' was actually more of a '+1 -10' to complexity because of dozens of spells and abilities being absolutely devalued by these fundamental using-the-sledgehammer-method changes. But those kind of objections are being blissfully ignored for the most part.
Literally +1 to complexity for Fighter, Rogue, and Ranger, and a -10 to all other classes. The player has the most strategic choice in Baldur's Gate 3 playing fighter, picking Eldritch Knight, utilizing scrolls, tossing barrels, chasing backstab, eating food, shoving, dipping, jumping, hiding, and using high ground, etc.
Most other classes are railroaded into trying to do the same thing, but they lack the stats to thrive.
Why use Fireball when Fighter can do better with barrels?