[tkot]

I specifically mentioned mounting (https://rclone.org/commands/rclone_mount/ which may use some additional storage space depending on the caching configuration) whereas you seem to be talking about mirroring the data in the cloud and on other devices.

[outofpaper]

From what I understand it's their friendly interface that differentiates them from RClone mount. I've only read their documentation but otherwise I can't see any benefit and only the risk of getting involved with a less tested tool.

[Rygian]

You still need to manage O(M²) rclone mounts.

The promise of Spacedrive is to have O(M) setup once, and then be able to access all files from all devices.