Comment by tuckerpo
I’ll admit, I’ve shown some of the same symptoms you’re describing. Not out of malice, but as the end-state of long-term burnout and disengagement, at an old job, many years ago.
In my case, it was a slow, creeping decline. I started out hungry: shipping quality work, stepping up for projects well beyond my role and pay grade, even leading teams through fire drills and heroic launches. And the reward? A generic "atta boy!" and more work. Never the raise, the title bump, or real recognition.
My attitude over the span of years regressed considerably, shifting from a bright-eyed aw-shucks happy-go-lucky get-it-done engineer, and asymptotically approached, "dude, please leave me the fuck alone" whenever I heard a Teams ping or an Outlook inbox notification.
Really just smells like symptoms of extreme burnout, the input of which can only be determined by talking to this person. Could be 10 years is far too long in one job and they just want to coast now, could be personal reasons like a divorce or death of a close relative, could just be mid-life crisis, could be "I've got 1.8mm in my 401k, what're you gonna do, fire me?"