Windows 10 was not as good as Windows 7 for its time (and even now). After 8/8.1 things started to go downhill. Windows 7 was a really good polished OS with beautiful and consistent UI. Windows 10 UI looks like a Frankenstein, and MS fired a lot of QA folks, now the testing is primarily done on the insiders and regular users. Also these privacy / telemetry / ad problems started from Windows 10.