I created an account just to post here, because of this issue.
When I bought the season pass, I purchased it because I understood, right or wrong, that in so doing I wouldn't have to pay for the same content for the PC version. I effectively have to do so, which is... intensely frustrating.
Frustrating to the point that, unless something changes dramatically in the coming years, I will never purchase anything by Obsidian again. The opening poster was far more in-depth and polite than I can be, so I will leave it at that.