The grass always seems greener. Dev jobs are objectively very comfortable. Problems exist in all industries/occupations, who's to say they aren't equally frustrating.
This. I have also felt very burned out and frustrated with our industry, but with a little therapy I've found that most of my unhappiness comes from within, and once resolving those issues I've realized that being a developer is one of the most comfortable, privileged position one can be in. I can literally change a job in a matter of weeks, I have ridiculous salary, and most of my job I actually even love! Not so much the case with a ton of other jobs.
I've done a variety of different jobs in my time, and standard dev work (in a corporate environment with managers and pretend-agile and JIRA etc) is by miles the most stressful, confusing, complicated, bullshit-ridden job I've ever had in terms of day-to-day experience. It's also the most well paid – that's what evens it out. It's not that all jobs/industries are equally frustrating (which is obviously untrue, to anyone who has worked in more than one industry).
The 'objective comforts' you get at some places, if you mean stuff like pingpong and free beers and lunchtime yoga, are sticking plasters that don't actually get much take-up. The only real 'objective comfort' is the high pay, which makes the rest of your life more comfortable, but doesn't make the day-to-day experience of the job any less frustrating, hence developers 'burning out' so often.