Encumbrance in WotR actually bugged me more than in BG3, though admittedly that's probably because of the way I'd set up my party. Or I might just have been doing it wrong. My party could carry vast amounts of stuff to the extent I never had to think about weight in the shared inventory, as I had two triceratops animal companions. But I also had three very weak characters (Nenio, Daeran and my PC) who couldn't manage to wear the armour I wanted, carry backup weapons or put the stuff I wanted them to have access to in their item slots, or at least not all three at the same time. I ended up giving them strength boosting items which they only needed for that reason and which ruled out other items that would have been more fun. And of course I could have boosted their strength on level up, but I resented doing that just so they could be properly equipped.
Admittedly, I end up juggling stuff from my weak BG3 PC's inventory fairly frequently, but at least she can wear basic light armour and carry the potions and scrolls she needs to use!
For party encumbrance in WotR all you need to do is to make sure you have at least one party member who has an animal companion. Animals have very high strength numbers, and having even just one in your active party is all it takes to get more than enough carrying capacity. I usually had at least two animals (not even horses but rather dogs/wolves/boars), and never had an encumbrance issue.
For individual characters, it really comes down to a very simple rule: don't put anything other than light armor on any character with less than 14 STR. With light armor and weapons, my low STR characters never go over on encumbrance.
