With how Larian is handling the D&D rules I expect every build will benefit from getting 2 levels of fighter added. So lets look at Sorcerer, get to level 5 or 6 for Fireball, add 2 levels of Fighter for action surge and they using sorcerer points can do 3 Fireballs in a round to really nova. What does the Sorcerer lose, one ASI/Feat, level 6 spells, 2 sorcerer points.