Rsync should not be responsible for detecting what a filesystem can handle.
That makes the most sense to me. There are countless filesystems, each with their own quirks, and countless mkfs and mount options which just multiplies the possible fs behaviors even more. Best to provide controls and options for low level features and behaviors, and let the user or a front end orchestrate using them however appropriate.
This argument falls apart a little bit if rsync ever does any other special built-in support for any other filesystems like nfs or something.
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