Submitter changed the title to mock BTRFS. Which is funny, since APFS is probably at least as bad, and likely much worse[1], yet given how many Apple fanboys there are here, I doubt similar mocking of it would be tolerated.
I'm not sure if you mean "user" or "reactOS devs".
If the latter, I can't be sure (besides the fact it's modern and has plenty of features), but as a user, I chose btrfs for its "subvolumes".
With subvolumes, you can selectively mount subdirectories in the partition without an explicit "bind" mount.
For example, I have 3 linux installs on subvolumes /rootfsUbuntu1804 /rootfsArch /rootfsFedora27. They all share the whole partition so I wont regret giving one too much space that it will never use, or worry about resizing partitions to create a new one. The fstab of any looks something like:
(the "compress" option there is also neat.)
If using as /, you must add rootflags=subvol=rootfsUbuntu1804 to your boot options.
I also have my home directory and other "shared filesystem" things (like docker) as subvolumes, each being shared to reduce redundancy. The only downside is graphical file managers see each mount as a "device" so I have a lot of noise in the sidebar of Dolphin or Nautilus.
Submitter changed the title to mock BTRFS. Which is funny, since APFS is probably at least as bad, and likely much worse[1], yet given how many Apple fanboys there are here, I doubt similar mocking of it would be tolerated.
[1] https://bombich.com/blog/2018/02/15/macos-may-lose-data-on-a...