Depression also seems to teach people valuable lessons when they survive it. For example, it leaves some people far more resilient in certain circumstances.
It’s the classic “what doesn’t kill you makes you stronger” adage at work. The sad thing is that it does kill many, and for some, never leaves in order to make room for growth.
As for the tunnel vision, that’s an interesting one because it does let you focus in on a problem exceptionally well and that could be useful. The trouble I’ve found in myself is that I haven’t always had the tools or resources to do something with that attention.
You end up intently focused on a problem, and it just becomes a painful echo chamber instead of an opportunity to address something. I suspect this is largely due to a lack of understanding and teaching. Perhaps too, like you mentioned, we expect medication to function as a solution eventually, relieving ourselves of any duty to investigate internal solutions. Had I known how normal depression is though, how it can present, how it can be managed, I suspect my own experiences could have been a lot better. It’s impossible to be certain.
I definitely disagree about the ups and downs in any case. Struggle defines us and helps us grow. Getting better doesn’t have to be a fun or enjoyable experience.