They get doubled points in attribute and skills. 2 extra ap and %30 more vitality, p&m armor. So they scale crazy amount level after level. Especially at milestones such as level 9. I played both and when my lone wolf duo get to act 2 they were pretty op. And I find 4 man group tedious in singleplayer.
Same here, hate managing too many characters. It was the only thing i didn't like in Pillars, tho it was much more min maxing them in that game. Lonewolf is way more fun for me. They should have made it a little bit harder tho like in the previous game.
