Nowadays Windows is filled with adware and is fairly slow, but it wasn’t always like this. Was there a particular time where a change occurred?
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That’s not the question though, they may have backwards compatibility as a sacred cow, but the theme of their changes as of 8 and newer has broadly been more about trying to force other Microsoft agendas rather than trying to just make a better product.
Though I have had some older titles that work better with wine, or even older where I need dosbox to run it.
I seemed to touch a nerve to even imply Microsoft ever has compatibility issues…
Yes, you can get “modern” and give Microsoft continual money, yes, that was the whole point.
As to no alternatives, well, there are. FreeIPA is pretty squarely an Active Directory equivalent. The challenge is that if you have both Microsoft and non-Microsoft infrastructure, you have to use Microsoft management for both because Microsoft will only interoperate with the Microsoft solution. Once you have any Microsoft, then the only option for an all encompassing solution gets automatically locked down to only Microsoft.
Since you probably are employed by Microsoft or a Microsoft focused business partner, your perspective may be a bit skewed.