Well, Angular.js devs are scarce. It's not outdated - it's ancient, not supported (literally deprecated) and just not good enough once you see the alternatives. jQuery would get the job done too, would you pick it for a new project now?

Also due to how the front end world looked back when Angular.js was good when you join a project now it's a Russian roulette as far as quality goes. Usually full of weird constructs and antipatterns written by people that don't want to let it go.