Aparently not – the store page doesn’t say it requires a third party launcher (which it says for EA and Rockstar Games), only that you’ll need a battle.net account, which you could create online. A journalist has also confirmed this on twitter, although I don’t have a link right now.
It’s quite similar to Obsidian, if you’re familiar with that.
It’s a notetaking app that lets you visualize how your notes are related to each other, and gives you plenty of options for formatting.
It’s quite neat to play around with, but probably overkill for daily note taking, unless you appreciate the UX.
I don’t really see how what you’re describing relates to patient gaming – isn’t patient gaming moreso to do with waiting until games drop in price, then getting them patched up with all their DLC?