If you already have 30 STR, 2 STR more won't do much, so even in midgame they turn quite pointless?
Presumably the attribute system will end up less inflated (particularly from loot) in the final game so each point will be a bit more meaningful. And I suggested a base bonus of +2 str, so +4 strength with five star diner. A +20% strength damage boost, +20% earth resist, and 30% heal is quite something for 1 AP, though perhaps that's about the bonus investing a talent point should grant.