To be honest, if Larian really wants to mess with "balance" they need to take their time, so they can adjust the whole game to those changes.
We don't need talents that give 25% elemental resistance in one specific school, the talent would be horrible. 25% resistance in one element or 2 attribute points... I wonder what the majority of people will take...
Also no need for a gain/loss resistance system, if they wanted that, they should have tested it in BETA. It would make weather the storm add 12,5% to each element making it not worth it, to take it. Although atm it already has lost it's use.
Larian just needs to rethink their strategy on how they will do this, since it affects major parts of the game. If they are hellbent on balancing the resistance issue they will need to redo a lot of stuff.
"Easiest" balance "fix" at the moment would be something along the following lines:
-Adjust overall resistance gained from elemental essence/rubies. -Adjust overall resistances on equipment. -Adjust overall resistances gained from spells. -Adjust overall resistances on potions. -reconsider removing the 20% resistance debuff from wet/burning/poisoned etc. Hardcap 100% so immunity is attainable. -consider implementing talents that would raise the hardcap from a SPECIFIC BASIC element to 200% with the drawback that you can not attain it for the opposing element or a similiar drawback.
In overall this would lead to a more well balanced resist gain from 1-20+, it would mean that items/skills/spells/abilities/etc would have all been adjusted. It would keep rubies/elemental essences valuable so players finding rubies can still be happy or players going on there essence round on level up, still have something to spend gold on. It would also keep some value to crafting. With a 100% hardcap that allows immunity I'm sure it would keep a lot of players happy and finally allowing 200% hardcap with a specific talent would allow players to still experiment with different builds and it would use up a talent slot on something else then feeding it to the demon for 2 attribute points.
It would also make sure that weather the storm would keep it's value and sword of the planets would again be a viable choise for a 1hander on certain levels.
Atleast team Larian would have to pull something like that of, in terms of truely balancing it, while making it interesting for different groups of gamers while still making sure versatility on builds is safeguarded.
Ofcourse doing something like this would take a long time to pull off and for a finished product it would be considered a big change. However as I stated in my earlier post, rather something well thought that takes time an will work then a hasty change with undesired results.