It all depends on how you look at it, and perspective depends on where you are in life and what have you experienced. I agree, for some people it's not being overambitious, it's just continuing a long term path.
I tend to use an example to explain this topic to people who I speak about this irl: The moment you stop enjoying your kids or you miss out on your parents last years because you were too busy being ambitious, then you have to realize you're being overambitious... Of all the senior people I've talked to about this, I get a similar advice: Don't prioritize your job or your selfishness goals over your family or friends, but also learn to discriminate who deserves your attention and who doesn't, don't waste your time in the wrong people.