Being a great manager requires being good at a whole set of specific skills, and that takes effort and some natural talent.

It can certainly overlap with what makes a great engineer, but not most of the time.

I think I am a better manager than engineer, not because I'm a shitty engineer but because I recognize the superior strength in my team and do waht I can to leverage the basic principle that if someone is better than you in many things, they should still specialize in the thing they are best at.