Now there's a very simple reason for resists mentioned on Man-at-Arms characters. I suggest you check out the Weather The Storm talent. This is combined with the fact that plate armors come with 4+ resists instead of 0-2 and can be further enchanted to give even more. Also shields.
Meh, by the time you have Man-at-Arms 5 it's easy to be immune to everything anyway. A few essences is all it takes. I suppose it's nice to be
more than immune, but then again only a melee class needs that because they're the only ones who even take damage.
Isn't that great? I love all these topics about "class X is too strong" and "class Y is too weak" and all the contraditions coming with them.
In fact, you can suceed with every class if you use the right gear and tactics.

Yup, unfortunately it shows Larian screwed up the difficulty curve. Every class is a borderline demigod by the endgame, which makes me wonder why anyone in Rivellon was worried about the Void in the first place. After all a single one of my characters could have beaten it in their sleep.