During my initial run, I beelined to the Goblin Camp and Moonrise Towers, bypassing a significant chunk of Act 1. Surprisingly, I still managed to reach max level and got decked out with premium gear, all while glossing over much of the act 3's content.
In terms of companions, I sprinted past several and ended up with just Gale, Halsin, Jaheira, and Shadowheart. It's only now, on my second run, that I'm realizing how deeply tied Act 3's content is with these companions—though Halsin and Minthara seem to be exceptions.
I've since added the "Multiclass to Level 20" mod and the "Party Limit Begone" mod. Excited to dive deeper into Act 3 this time around. Still, there's a part of me that worries if the ending might not hold up to my expectations, given my initial experience.