dustymabe added a new comment to an issue you are following:
> The main reason given for keeping "two partitions" by
default with docker-storage-setup is so that users can easily switch back to devicemapper
if there are critical issues with OverlayFS.
I would like to also point out that one other benefit would be to prevent containers from
cannibalizing your root partition.
This might be of interest to counter my previous point: [
Implement XFS quota for overlay2](https://github.com/docker/docker/pull/24771)
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