This is a strange sentiment based on my experience.
I leave most jobs after a year because they get boring. I've never not shipped a fairly important project in the first 6 months of employment. After a year nearly every place I've been at has been struggling to find that next thing for me to do since I've finished all the projects they had in the backlog when hiring.
My experience is that at most orgs the one year mark is when coasting begins and I personally find coasting incredibly boring.