Gale, Wyll and Minsc are Human while Shadowheart and Jaheria are Half-Elf (Half-human). There is human majority in the game already. These stat changes nerf 5 companions even if we choose another race for our character(assuming Larian doesnt want us to pick human).
With a +2/+1 instead of a +1 to all stats:
- Gale and Wyll will likely lose a point of Con (15->14), and then another point in one of: Str, Dex, Wis, or Con.
- Shadowheart's stats won't actually be effected because her old build "wasted" the +2 Cha.
- I expect similar effects for Minsc and Jaheria, since Jaheria at least would originally have also been "wasting" the +2 Cha bonus.