Exactly, I have two notebooks on which Windows 10 Update claimed "everything's OK" and one is completely unusable under Windows 10 because the WiFi card driver

Exactly, I have two notebooks on which Windows 10 Update claimed "everything's OK" and one is completely unusable under Windows 10 because the WiFi card driver is unsupported by Intel and crashes the whole system, and another is unusable because the touchpad doesn't work anymore. On the former, even rolling back to Windows 7 turned bad, as all tasks (created by Microsoft, not by me) became somehow invalid.