Still resorting to personal insults? Is that all you can really offer?
Why you seem to think OS development experience is at all relevant to knowing what a beta release is a mystery. It's still a form of software. A very niche one in fact.
I have stated my (business) software development experience. Which oddly enough covered a lot of low-level interaction with many operating systems.
You go on about businesses still using XP. Quite! It's only since Microsoft came out with the increasingly non-reliable and/or non-user-friendly follow-ups that business stopped adopting new Windows versions within 12 months of release.
The management and the IT guys in these companies are very hard-headed. They aren't playing computer games. I varied between being one of them and supplying them.
Businesses depend on things working. I produced in various capacities business applications that worked from day one, with minor fixes when necessary, and ongoing major enhancements as the business needs changed. Which they can do very dramatically and suddenly. A world I don't think you are aware of, but the world that says "we want XP".
That isn't the state of Win 10 OS.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
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