That should meet pretty much any password requirement, be virtually impossible to guess or brute force, and you won't have trouble remembering it (because you don't have to!).
Lol I wish. Almost all of the important sites I use, like various bills and loans, use terrible password schemes. One even, until recently, enforced an 8 character limit! I think they raised it to 16 iirc. Oy.
Hell, even the company I work for frequently fails my password generator settings. The arbitrary character requirements of my ~20 character password would sometimes not be satisfied when I was creating accounts in our dev system/etc. Which is annoying as hell, but I can't convince management, because our users (older) tend to use some of the worst passwords out there.. so I can understand where it's coming from.
Security & UX is hard.
All it takes is the one time, for whatever reason, that you have to type in a string of a few dozen random characters by hand on a phone keyboard or something because you're on a new device, or cut and paste is disabled, or whatever, and you'll understand why long random passwords should be reserved for web servers and so on and never used with consumer web applications like a hotel reservation program, or rental car app, or similar.