I live in the California bay area (not going to get more specific than that), and split rent of a townhouse 50/50 with my partner. I live in a stupid bougie area too, so I'm not doing myself any favors there pricewise.
You cannot get a SFH here for under $2 mil, and our townhouse we rent is worth well over $1 mil. I could easily afford the whole place by myself, but that would be financially irresponsible. I was very fortunate to be taught at a young age that being able to afford something does not make it a good or okay use of money.
If I weren't living with my partner, I'd get a one bed or studio apartment for ~$2200 a month, or an extra $6400 a year. Unless someone took on a mortgage way larger than they could actually afford (again, a financial literacy issue), or has an extremely expensive medical condition, I have 0 idea how anyone could be paycheck to paycheck on $150k a year and unable to massively cut back. The world is expensive, but it ain't THAT expensive.
All fair points, and I'm definitely leaning more towards your viewpoint having read them.
I guess I've just never felt the need for them given I've been treated and paid well so far, and I really like the ability to just walk next door at a moment's notice if I so desire. Not that I've ever not given two weeks, but the option to do so, and not feeling like I'm gonna be compensated less due to short tenure is nice. Not that unions have to operate that way, but historically that's the case.
I'm glad it has worked well for you! I'll definitely be more open to joining one in the future, and strongly consider it if the opportunity arises. Thanks for your perspective.