The other plus of text replacement is synchronization. I have a bunch of LaTeX style symbol names mapped on my Mac but they work just as well on my phone. I’m typing this on a phone and \Omega is automatically replaced with Ω or a favorite of mine \shrug becomes ¯\_(ツ)_/¯.

I also spend time on Windows and nothing seems to come close to this convenient (win-. has a few useful things like the character picker panel in macOS but to get more, tools like autohotkey feel really cumbersome).