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I thought the flexibility of BTRFS was that you could basically always add subvolumes. Shows what I know.
Yes, you can. But the usual setup is to have a file system root that is nothing but subvolumes, which you can then use and mount basically as if they were independent partitions. But when you don't create a root subvolume for your system root first, you install the system directly on the file system root alongside created subvolumes. This tends to get messy as strictly speaking the file system root is a subvolume, too. So now you have that with your system installed and all other subvolumes nested inside it.
Yes. Usually the OS installer takes care of creating a root and home subvolume. Except Arch and similar barebones installer have instructions in the wiki.
Yes, you can, but now I have to move the entire install to a subvolume, risking borking the install 😒.
Or, ya know, just reinstall right quick.
Yeah, I'm thinking between that and rsync-ing to a new subvolume... the install is just bare bones, almost nothing was set up.