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> Unmodded for Morrowind to me at this point just means official content running in OpenMW. 
That is indeed doable and enjoyable. Morrowind has it's own quirks but nothing that absolutely needed to be changed or added. At least from the top of my head.
Tho I think Morrowind has the least amount of mods.

I wish they made OpenMW compatible with other Bethsoft games - there were experiments with that couple years ago. That would make it easier to play 'em on Linux for sure.
For example for me F3 and F:NV is almost unplayable surprisingly F4 runs smooth without lag and I suspect because of Wine. They lag hard often and I suspect the reason is how the sound files are packed in the .bsa archives and retrieved and such. For example Radio lag is fixed by adding a mod that adds the sound tracks in .ogg format. I believe a native implementation of the engine would fix that.