On macOS, the most annoying thing for me is the inability to use the native login to authenticate to apple web services. I have to type in my apple ID, my password, and then the code sent to one of my devices every time. On chrome and safari, I can just use my fingerprint or laptop password and done.
Yes. This bug makes the UX on mac just feel broken and frustrating reminds you every time you do it. Tried to bear it for a year but I use text replacements so heavily that I had to switch off eventually. Firefox: for the love of Jobs, fix it!
(the bug is that text replacement does not work in FF on mac, something that saves me so much time daily)