For your second point, you live with it. I haven’t found a solution, at least. I’ve never landed in spam for corporate offerings (cloud O365, google workspace or whatever they call it now) or (very rare these days) anyone self-hosting with rspamd or equivalent, just regular personal mail (hotmail, gmail, iCloud, etc). That’s usually pretty easy to detect and work around (“hey I sent you an email” “oh I didn’t get it” “did you check your junk?”) Irritating, but not the end of the world.
I’m going to try hosting from my residential IP sometime this year, now that I have sufficient redundancy in terms of power and networking. I don’t know if I’ll have better or worse luck than with hosting providers’ IP ranges, though.