Do you care how useful the thing you're building is for the people you're building it for? How well it fits in with what other people on the team are building? If any of your teammates have ideas that could be helpful, or have learned things that might be of interest to you?

I've often been the guy who comes in to help untangle a messy code base, and an entrenched "just let me build shit" attitude appears to be a chief predictor of unextensible and inflexible design. Even when not in a managerial role, I don't like to see people working in silos because experience has taught me that I'm gonna have to deal - as a fellow dev - with repercussions of poor design sooner or later.