>Supporting , fixing project which I delivered over years and just take it easy, start day late, leave early until retirement.

My experience has been you'll be regularly moved around to mitigate the "bus factor"

If you're seen as highy capable you'll be moved on to firefighting duty.

Yep, and if this happens you need to get promoted quickly out of that or you’ll get stuck at it. It’s great fun, and you’ll learn about every project your company has going on by doing it.