I played a Barbarian with the bear aspect (and before that, the gear that granted you double carry capacity), and I still found myself encumbered since I kept looting all the heavy stuff I could sell.
Even after clearing out all the loot, I was still left with a ton of scrolls, potions, poisons, etc. that I was “saving up” for a potentially difficult encounter, all taking up 75% of my carry capacity.
It’s certainly a way to discourage hoarding and encourage you to use those consumables, especially since BG3 has an end, but I wish there’s a better method for it.