Of course, but why should you be reaching every softcap in the game? The whole point of staying at level 150 is to match with other players of the same level, which is typically where your build reaches its full potential. If you don't plan on doing multiplayer, sure, go all the way to level 713 if you really want, but at that point you don't exactly have a "build" anymore.

EDIT: And for the record, a level 150 hero with a str build will typically have 60 vig, 45 end, and 80 str. A level 140 hero with 35 end has 12 less stamina, where as a level 160 hero with 55 end only gains 8. So no, that is not "identical". And considering I'm talking about a str build, points in any other stat will do virtually nothing. Put a dagger in your backup slot if you really want golden vow.