Sneaking in this game is mostly pointless, there's really only one situation I've used it in.
Full murder hobo is pretty much the way to escape Fort Joy, especially if you ever move to tactician. You'll need every bit of experience you can get on tactician.
You've inspired me to download the game again and start another playthrough. Are you running a mixed, physical, or magical damage party?
Well, I just hit Act III and I'm 55 hours into the game (went full murder-hobo at the end of Act II for loot and experience) and just made my way into the pocket dimension of the Imps, which is where I decided I am done with this game.
Having my party slowed to 50% speed and all sorts of exploding traps and poison everywhere, plus a valve you can turn that just releases deathfog and wipes your party is the final straw that broke the camels back.
I wanted to like this game, I really did. The writing, narration and characters are interesting.
But with EVERY fucking encounter being essentially an ambush where your party is on the ground bunched up together, while enemies are all on raised platforms and spread out (so they can hit your entire party with AOE attacks but you can't do the same to them) and most fights resulting in party deaths where you need to save-scum and replay the fight with your advanced knowledge so you can handle it (note: this is NOT fucking fun, it's frustrating in a game that is 100 or so hours long) it's just too much of a fucking chore and grind.
Not to mention, you can only have a party of 4, which means two companions get left behind and you don't experience their storyline. Who the fuck wants to replay a 100-hour game to try and see what the 2 missing companions had going on?
And who the fuck put exploding or poison battles EVERYFUCKINGWHERE???? Every encounter doesn't need to have you slowed, on fire, electrocuted, etc. Every step you take on the map there's traps and poison to traverse through. It's like you're playing with a DM who fucking hates you and wants you to have as miserable an experience as possible.
This game showed so much promise, but I cannot recommend Divinity 2. Too much time is needed to be spent googling obscure puzzle solutions, managing your inventory is another time waster that takes forever as you compare items to see if you should switch them out on characters or not, etc. And don't get me started on the crafting system, sometimes less is more Larian Studios.
And then there's the "class" system. It doesn't matter if you play a fighter, cleric, rogue, wizard, etc. They can all just pick skills and be essentially the exact same. The wizard can go sword and board. The fighter can cast fireballs and summon creatures to fight for you, if you select the right skills and abilities. It waters down the specialties of each class when they can all wind up being essentially the exact same regardless, they don't feel unique in their own right.