This is a really useful feature in Obsidian. By sorting my tags by the number of times the tag has been used I'm able to see where my attention is focused. "Oh, wow I had no idea that I had so many notes about body language." In a addition when looking at a view (whether tag, collection, etc) it would be handy to be able to click on on item and hide it from the view (basically instantly creating a "Title" is NOT filter.) This is extremely useful in going over research. In my use case about of looking at topics to see where I've been focused I can have all my tags sorted by frequency and then "Yes, I know I've already dealt with body language." CLICK. It hides. "Okay, so what's left. Ah, Colonialism."