Different versions of the ARM architecture with different ABIs. From the Debian POV that's a separate architecture to support. It could have been done by Debian, but was done by a third party, just as other minor platforms are supported.
I don't agree that it has a "different experience" because the tools and infrastructure are there to build the entire distribution from scratch. And this was done. I've done it myself several times. Once done, this architecture variant had the complete package set available for all the official supported architectures, bar any architecture-specific packages being added/omitted. Third parties can and do bootstrap and maintain entire architectures. I can't speak for the raspbian people and their port, but it's not hard to manually bootstrap the kernel and toolchain and then set an autobuilder loose on the entire source archive.
And that's the point I was trying to make about Windows; that's exactly what you can't obtain. Be it the old NT ports or the present day ones, outside the base "Windows" release and some key products, the rest of Microsoft's product portfolio is largely missing.
Yeah, it sounds like we're talking more about the difference between the limitations of open source and closed source than any particular failure on Microsoft's part to meet the expectations of its customers.
I don't think they're going to really square the circle in the way linux can, having everything available because everything is open source. On the other hand, it's not inconceivable they could end up with a server platform that does offer an awful lot of Microsoft stuff as open source, which also makes available all the linux userland stuff you'd want to have. Their handicap might be that not enough of their infrastructure software has made it to .net yet, but they've shown lately that they're willing to do some porting when it's appropriate. (Sql server!)
I don't agree that it has a "different experience" because the tools and infrastructure are there to build the entire distribution from scratch. And this was done. I've done it myself several times. Once done, this architecture variant had the complete package set available for all the official supported architectures, bar any architecture-specific packages being added/omitted. Third parties can and do bootstrap and maintain entire architectures. I can't speak for the raspbian people and their port, but it's not hard to manually bootstrap the kernel and toolchain and then set an autobuilder loose on the entire source archive.
And that's the point I was trying to make about Windows; that's exactly what you can't obtain. Be it the old NT ports or the present day ones, outside the base "Windows" release and some key products, the rest of Microsoft's product portfolio is largely missing.