nightcraw1er.488: Well, if you take Skyrim, there is a large percentage that do not appear on moddb or nexus anymore. Don’t think anyone has a conclusive list, but you can’t see mods which aren’t there unless they are removed, so there could be lots of other mods you are missing out on.
It could be me reading this wrong but most of the mods on Steam is stuff nobody uses because its incompatible with MO2 as steam moves the files over into the data directory when you install a mod, which breaks Skyrim easily the more mods you install. Besides that, approx 99.8% of mods that are of any importance are on nexus. Steam almost has no exclusive mods, mostly because the maximum upload size is way too low for any mod to be properly uploaded on Steam (most important mods that add important things are 2+ gb, such as 3DNPC, which also has a high possibility to break an fully fixed and modded Skyrim), and you need more than just Skyrim to properly use the game if you intend to mod it (FNIS or Nemesis comes to mind). Not only that but modders put some effort into bringing some of the important mods on Steam over to nexus, with allowance of the original author of course. The most well known skyrim mod that was exclusively available on the workshop (the Windhelm Arena in case people want to know) has been ported over months ago.
About 0.05% at most is workshop exclusive. so if nexus has 100.000 available mods, the workshop has about 50 that are exclusive to the platform. Not only that but even after looking several pages of mods there is nothing that is not on nexus when I crosschecked. Some modders on nexus also put their mods on Steam but the number is small. This means you have more than once platform available. If you want to mod Skyrim (or SSE, which is superior to Skyrim nowadays) you can use nexus and never worry about anything else, because it has anything you could ever want.
The stream exclusive mods you're talking about are either ripped from nexus or just small stuff, like some hut or island or some random trees, simple stuff like that.
Modding will mostly be nexus specific due to how consilidated and gigantic the international modding community is. It is simply too big to fail, but that has been obvious even before the release of the creation kit.
fridgeband: I hope that's not true. I hope the mod tools become for everyone. I trust taleworlds entertainment to do the honest thing. They're really good.
Of course not. The "steam exclusivity" is just the tools. Once they're mature enough, Taleworlds will release the tools outside of Steam. Besides that, most if not all mods will be uploaded into modDB, which is the most prominent platform amongst Mount and Blade modders for a decade now. Lots of mods there to check out.
I would even place a bet that there will be no Steam exclusive mods for Bannerlord considering how people are already planning to mod for Bannerlord and the discussion surrounding it.