I think a lot of this is because of the hobbiest roots of the PC, it was never taken seriously as a commercial device at first, and had broad tinkering support

I think a lot of this is because of the hobbiest roots of the PC, it was never taken seriously as a commercial device at first, and had broad tinkering support from the early days. They never could really abandon that stance because of those who adopted new products. Any attempt to do a sealed experience for average users was subpar in execution... except perhaps gaming consoles.