Bhagavad Gita, Chapter 8, Verse 15

Reaching the highest perfection, and having attained Me, the great-souled ones are no more subject to rebirth, which is the home of pain, and ephemeral.

The real payoff here isn't described as temporary or partial, it's framed as a genuine, permanent completion.

This names the actual stakes clearly. Not a nice improvement to ordinary life, but a real end to the whole cycle described elsewhere in this chapter, framed as the highest possible outcome.