If I were running a business and had to share passwords and control access to things for multiple users, that's probably what I'd do, but all I need is a synced password storage. Self-hosting a server's probably overkill for that.
Also, isn't the vault itself encrypted? You shouldn't have to encrypt extra to do a backup.
I have been using BitWarden, and it's pretty good, but I'm shifting over to Keepass now, syncing the database with syncthing. Means I don't have to trust they won't be breached, but it is definitely a bit more of a faff to get set up. For anyone unsure, I would definitely recommend a managed service like BitWarden though. I got my sister on it, who would probably have a single password for everything otherwise, and she got the hang of it super quick.
What about the "all" stream? Is that also preloaded to the server?
None of that is chromium. Vivaldi could have built that on top of Firefox, but didn't. As to why Firefox is better, the very fact that it's an alternative that is keeping up technically is a benefit. It's less a 'V-shaped engine' monopoly and moreso a 'V8 engine made by a specific company' monopoly. They have far too much control over the direction of web standards. Much of what they are doing is actually good, but it should then be spread based on merit, rather than because they directly control almost the entire market.
If 18's the limit, I'm below that most days, and perfectly comfortable. I just wear a jacket if I need to, with a blanket over my legs if it's particularly cold, and I'm nice and cosy.