Question

Late from me I guess, but other good reason to make a Hero early is so you can automatically drop some early job skills for other things because you won't ever use it again anyways. Skills like powerstrike and perhaps brandish that you won't ever use again because they'll be completely replaced. So, you'll have extra sp to max things like iron body and chance attack if you never thought about maxing them before.

I guess this is aimed more towards other jobs that have more useful things to throw their sp into like the way some people disregard nimble body (sort of buffed in post bb but it beats having a useless attack skill that you'll never use ever again at least) and magic armor.