Doing the sort of simple solutions to your specific job's actual problems can also be something that constrains your ability to work anywhere else. Often the best simple solution that's tightly integrated into your job's environment is something that is inconceivable as a good idea anywhere else. You're optimizing around other old decisions, good or bad. You're often correctly overfitting a solution to your specific problems.

I've often found myself now having issues even updating my resume, because what I did for the last year at work barely is explainable to other people on my team, let alone to someone in HR at another company. Or the more simple explanation is something that sounds like I'm doing work barely more complex than an intern could have done. Which often isn't wrong, but the intern wouldn't know which simple work to do.

My years of experience in the company's stack and org is valuable to the company, and nontransferable elsewhere.