Did you try to disable "Fast Startup" ?

By default, Windows does not do a real shutdown anymore. It closes the user session and hibernates, to speed up the following start up. As a consequence, the Windows partition (and EFI partition ?) are not properly unmounted.

Yes, you can click on the "Toggle sidebar" button on the top right

Having separate communities around the same topic could be a good thing? This would mitigate the hivemind phenomenon caused by the voting system with a large user base. You could discuss with like-minded people but keep the opportunity to read diverging opinions when you want/need to.

I would also like "hubs" on topics to discover communities, but a common feed might be counterproductive.