That's a very fair point. There are many times when burnout is perhaps not a philosophical problem, and there can be pragmatic, constructive steps to take in the short term.
The larger-scale structural problems (particularly the vexing in-principle problem of modern employment) have been the major proponents for my own self-study of burnout, and so I have a major availability bias when thinking about burnout leading me to connect it to those types of issues.
However, you seem to be painting an overly negative picture. I think in many cases there are actual solutions, but it's just difficult for people to make significant changes in their life. If your spouse is a bully/asshole, the best solution in many cases is to leave them. Of course this can be a very difficult decision to make, especially if you have children, but in the end it will likely work out for the best.
Also, I think that in a lot of cases it isn't entirely obvious what is causing the fatigue or depression, so there is some doubt as to whether changes need to be made. Many people prefer to take a pill, or get diagnosed with chronic lyme with an unvalidated test, or something along those lines. This is an easily solution than getting a divorce or quitting your job.
In some cases - where the problem simply cannot be rectified - the best solution might simply be to put up with the shitty situation. If you read the stories of Japanese prison camp survivors (e.g. "Unbroken"), it's simply astounding how much physical and mental abuse people can actually tolerate if there is no other option.
My own solution was to quit working for other people on soul-destroyingly boring jobs in soul-destroying cubicles from 9-5 and work full-time on my own business instead. Luckily I already had a side-project that people were paying money for when I experienced burnout, so I had a nice easy solution. I realise most people aren't so lucky.