Privacy concerns may well be overblown if one were able to objectively assess facts. Perhaps Windows 11 is the most secure OS Microsoft have ever produced :)

But I would still not use or trust it, for reasons the frog would not ride on the scorpion's back, no matter how desperately it wants to cross the river.

I've lived long enough to witness all of Microsoft's shenanigans, the hostile takeovers, the insults to free software, the lies, the threatening behaviour, the bribery, court cases, criminal convictions and fines. Insomuch as a company can be, Microsoft are unethical to the core. Indeed they are the paradigmatic untrustworthy company.

If you were to offer me a water-tight mathematical formal proof that Microsoft's code was secure and private, I would still choose to use to use something else.