Why do they have to be Steam Workshop mods? Nexus has over 1900 mods available now.
Because the Steam Workshop is way more practical to use and it doesn't take away from the Nexus crap existing, anyway.
It takes a handful of mouse clicks to install or uninstall a mod with BG3 Mod Manager. Using Steam and the 'Mod Manager Download' at Nexus is fine until something goes wrong then you have to seek help on the Steam and Nexus fora from people who are as ignorant as oneself.