That is sadly not the case anymore as the said Registry keys were removed in subsequent updates. Windows 10 originally had the aero theme with blur and transparency which could be enabled via a simple registry tweak. If you want the aero glass transparency with the blur effects right now, the only choice is using third-party hacks or tools.

There’s still a while before users can get a taste of Microsoft’s Fluent design which incorporates transparency and blur effects among others. You can complement the Aero Glass transparency in Windows 10 with a fully transparent taskbar. Many users wanted the Aero Glass theme back, and when Windows 10 was launched, those people still wanted the Aero Glass theme. Microsoft decided to remove it for a more flat, modern look on Windows 8 which once again tanked pretty much like Vista.

You could call Windows 7 a mixture of the best of Vista and XP. This is why Windows 7 then kept the design while leaving out the rest of the unnecessary stuff. Microsoft’s implementation of glass and transparency in the right places made Windows Vista an eye-candy, even though it failed in every other department. If there was one thing everyone agreed on about Windows Vista was that it sucked, but the Aero Glass theme was awesome.