I think your comment is very disingenuous. And not just because it's another subscription. That plan does not work if you got more than one vault, and if you use Obsidian you will probably have more than one vault.
Why would anyone ever want to use more than one vault? I just use different folders. The only reason I can think of would be if you are using Obsidian for work where you aren't allowed to use unapproved services.
I use one vault per video game. I don’t need to clutter up a vault just so I can link from a page on Art combos in Xenoblade games to a page detailing all the random things I need to pick up around Hyrule to upgrade this or that piece of armor.