Earlier quoted context omitted.
Is maintenance the cause of burnout then?
For me burnout comes from the endless treadmill of external pressures (arbitrary deadlines, changing requirements) and the endless treadmill of development work. There's not really ever a chance to step back and take a breath - just constantly moving from one high priority task to the next. It's also a bit thankless, being good as this job, in a lot of cases, means you are moving really fast from one task to the next…
Something I've seen more and more often is that a lot of developers take a lot of time for every ticket. Much more time than I'd take, but I suppose it's because they are not incentivized to work fast, they'll still get paid the same no matter how many tickets they close. But I don't think paying more if you close more tickets is the solution, I don't have any solution, really.