Nice one. I've always preferred a direct and simple route to log off/restart/shutdown and ever since the demise of XP I've run with this group of icons on my taskbar:
The whole range of components to disk access in various modes (sequential and the many types of random) is very involved but one component alone (seek time - the time taken to identify the location of data and then move the heads to the required ) is typically many times hat of the actual...
Next best thing to a nuclear assault - that will do nicely (but as a tight-pursed Yorkshireman I would still go for forensic wiping and get a few quid for it on ebay! https://en.wikipedia.org/wiki/Julian_of_Norwich
20H2 is a fairly minor update and will not remove any installed apps or user data. Your Windows system will simply have some features added. The 20H2 update has also previously been tested over time time by a large group of volunteer users called Windows Insiders so should be quite stable...