This is a inaccurate in my opinion. Obviously all developers should be writing code but in my experience there's usually about half new feature work and half m

This is a inaccurate in my opinion. Obviously all developers should be writing code but in my experience there's usually about half new feature work and half maintenance. A lot of the maintenance is of projects written by people no longer at the company. I guess you're advocating for a policy of complete silo-ing where devs only ever work on what they wrote in the first place and no one can jump in and help other teams under any circumstance, but at least the companies I've worked at have not advocated for that policy