Mod Authors may not be aware of the restrictions imposed on the Steam Workshop.
One of the worst being you have to own a game on Steam to use the mods at all. GOG owners can't even download Workshop mods.
This goes against the principles of free,and open mods, available to all owners of the game.
Along with the fact the Workshop is restricted to downloading files to just one folder, which excludes mods that won't work from that folder.
Often that includes packing the mods into somne sort of archive. like the .pak ones used in DOS1, and DOS2.
This makes the Steam Workshop simple to use, because only simple to use mods are allowed.
These mods are just as easy to use, outside of Steam's wall.
Even when I own games on Steam, I avoid the Workshop, like the plague. Then I can at least download them, and make my own archive based mod.
Simply packing the Workshop mod files (Not the numbered folder), in an archive using a tool like 7-zip, is all it takes.
They can then be easily uploaded to Nexus Mods, or any imdependant file host you choose.
Divinity: Original Sin 2 Nexus - Mods and communityMany game devs, fall into this "Workshop is easy" trap, and thus actively promotes locking mods behind Steam's walled garden.
Many new mod authors then follow the developers, into that same walled garden, instead of supporting free and open modding.
So at least consider uploading your mod outside of that walled garden.
Even if you decide to post on the Workshop.
Let all DOS2 users enjoy your mods, not just the ones already trapped behind Steam's Iron curtain.