The only reason I can think of is so that they can use the same FS in both windows and linux -but with ntfs, they already can.
Mind you, with openzfs (https://openzfsonwindows.org/) you get windows (flakey), freebsd, netbsd and linux but -as I said; I'm not sure zfs is super reliable on windows at this point.
Mind you, I just stick with ntfs -linux can see it, windows can see it and if there's extra features btrfs provides they're not ones I am missing.
Mind you, with openzfs (https://openzfsonwindows.org/) you get windows (flakey), freebsd, netbsd and linux but -as I said; I'm not sure zfs is super reliable on windows at this point.
Mind you, I just stick with ntfs -linux can see it, windows can see it and if there's extra features btrfs provides they're not ones I am missing.