This is a good saying and sometimes true, but mental illness is usually a forever problem. I don't say that to disparage it either; depression, anxiety, schizophrenia, and internalized abuse fucking suck and it takes a while to tear down the self preservation instinct to the point where an ending can seem appealing, even if just for a moment.

A permanent solution sounds pretty nice

Works 100% of the time when completed. You can't argue with results

If you think this you're incredibly privileged.

One person's problem is over but everyone who cared about them has problems that are just beginning

the temporary problem of always being a corporate slave until I die anyways, and failing every attempt at running a business or getting a better paying job, etc. Health continually tanking, bloody poop, constant migraines, cognitive decline, way behind on taxes again, feeling stressed out by any and all social stuff, no motovation to do anything yet trudging on for no idea why, nothing is fun, earth is being killed by the ultra rich and nothing is working, the masses are becoming more stupid and only helping worsen everything. dunno probably more. it comes and goes for me. my animals still need me but if I didn't have them I wouldn't have the energy for more of this shit. Maybe if it didn't cost so much to merely be alive, let alone do or have enjoyable things.