"By that only 4 years support argument why buy Windows 10?"
Well, yes. Why? It's not a foregone conclusion.
On the other hand, if MS stick to their stated aim of Win10 being the last Windows you will ever buy, they've adopted essentially the same model as Linux:- No given release is supported for more than a few years, but an upgrade to the latest release is free and usually runs all your stuff.
(Possibly this is why Win10 is now so annoying. MS aren't making any money out of it so they might as well use it as a public beta for all their crazy ideas. The distinction between "current branch for consumers", which makes no money and gets all the shitty experiments, and "current branch for business", which makes money and perhaps skips the experiments that didn't work, would suggest that this is exactly how MS now feel about their former cash cow.)
Biting the hand that feeds IT
