They nevertheless shipped their core product with a completely broken core feature. I am not sold on this software as a service/the OS is in permanent beta approach.

In general I have an even bigger problem with the philosophy of what an OS should do. When I switch on my computer, it's not to admire the OS, its beautiful UI, etc. It is because I want to do something, code something, watch something, read something. I live in the applications not in the OS. The OS should be effortless, surprise-less, it should hide behind and do its basic tasks well. Windows 10 is the exact opposite. It's an OS that is in your face, which interrupts you with full screen banners all the time, which reboots you all the time, which shows you ads, shows you modal pop ups to tell you to do things differently, etc. This is not what we need an OS to do.