You're essentially saying, security and performance improvements are all you want. You have that, it's called Windows Update. Cool thing is, it's free.
It should be glaringly obvious that Microsoft suffered from a huge amount of stagnation. Essentially they did what you wanted. Meanwhile, Apple and Google ate Microsoft's lunch, taking away a huge portion of their market base, and Microsoft has been in catch-up mode ever since.
You and several others on this board just seem to hate the idea of change. All I can say is, get over it. It happens, and it will continue to happen so long as there is healthy market competition.