I've just found out that here in Oz, the divorce rate is actually 46% . Stopped me in my tracks. When I stopped working a decade ago, my salary was about 70% of my husband's. The kind of job that I'd get now would be worth about 20-25% of is current salary BUT because I'd be paying far less tax it would be worth significantly more as take home pay.
However, as with the original OP, I am stymied by mental health problems, and there's no point in saying "that's fine, but just make sure you keep a bit on track", or "watch out for if you get divorced" as if MH is a movable feast. If someone has a physical disability that made work impossible, I don't think anyone would be telling them to keep on working just in case.
All I can do right now is make sure our dealings are as equal as possible (ie house in both our names, life insurance, savings etc), and do as much as I can to stay up to date on changes in things that those at work would take for granted. Software, and technical requirements in the areas I have worked in.
In a good week I can see myself that I will get back to part time and eventually full time, but frankly I'm kidding myself.
OP, if you can honestly say that it works for you, and at least can see a way forward if you were left high and dry. ..you don't need to plan to live at the same level you do now, in worst case, just that you think you could survive.