[Endoperez]

Human mages would still be recruited over human commanders, independent commanders would still be the most often recruited type to lead units, and only human sacred/otherwise elite melee commanders would really benefit from this (they MIGHT have a minor use with the change)... except that the best of the best humans already have increased hitpoints. Paladin - 15 hp. Black Lord - 17 hp. Lord Warden of Man - 20 hp (although that's from a magical enchantment, LW of Chelms has "only" 14 hp.)
Some of that seems to be 2 bonus hp that heavy cavalry seem to have. Daimyos of Jomon only have 11 hp, but lesser Hatamotos have 12, so I quess Daimyos are meant to have 13. Hoplite Commander has 13 hp, Agema Commander has 15 hp, etc.