The only thing you’ll be missing is lack of Internet features and the GUI.
You can even run the Switch UI in Suyu (or other forks of Yuzu): https://youtube.com/watch?v=rOLoVZ_br9M
And both Ryujinx, as well as Yuzu (and Forks) offer local/online multiplayer:
https://github.com/Ryujinx/Ryujinx/wiki/Multiplayer-(LDN-Local-Wireless)-Guide
https://yuzu-mirror.github.io/help/feature/multiplayer/
3 points
Both of them offering online features is true, but as far as I’m aware, you ain’t connecting to any official servers.