Coasting is the norm for most people once they get past the “up or out” part of their career. There’s a lot of variance in how long that period lasts depending on the line of work, but after that for every 10 people you’ll have:

2 who work hard and are net additions

2 who actively work against things to maintain whatever they have

6 who are just content to be there, do what they need to do to continue to get paid and lean towards whichever of the above groups make their life easier at any given time.