> it used to be that i pay your due at some enterpise and learn some corner of codebase really well and become go to person. that would give you job security.I

I had the displeasure of working with those types. One of them replies to any question or challenge to a technical problem emerging from the PRs they posted with variants of "I've worked here for over a decade, this is how we do things". And then proceeds to argue things like defensive programming is a code smell because it means developers don't trust themselves.

I cannot envision any healthy, effective engineering environment where developers don't periodically switch between projects.