I wouldn't use Windows (especially 8+) for anything other than superficial activities like gaming. It's a shame as Windows is more polished, but I miss the days when an OS was an inert thing you didn't have to think about (damn you Internet!).
The BBC is discouraged from producing its own content, so a lot of the content is made by third parties and the BBC doesn't have the rights to broadcast them outside the UK. That's why you get BBC branded channels in different countries because those channels have to compete to buy the rights. There's lots of other things too, like music rights, sports rights etc. Means the content has to be redone.
I doubt it will change. Content producers don't want to give away content to an all-you-can-eat service. It's expensive to produce the material, so they need to milk it at every level.
In terms of content quality, Netflix (and their competitors) are the equivalent of a free-to-air TV channel with occasional big ticket titles that they likely blow their budget on.
