The only potential nerf was shield dwarf. But even then it's too early to call a nerf.
Humans got a strait buff with the +2 main stat and proficiency an extra +1 in dump stats doesn't matter.
Similar story with half elves they lose 1 point in con or dex, not a big deal, and the light armor profincy for full casters is great.
I disagree with you on the half-elf. If it were medium armor, then sure it would be a step up, but you'd need a +2 light armor to match a single spell slot, and a +3 to beat it. The difference in dex is also a +1AC, which is the same benefit as the only light armor that is readily available.
