Well I didn't mind when they removed it and certainly I didn't consider their paid version which is way too expensive for most use cases.
The UI was useful when first configuring the buckets and permissions; if you've got it working (and don't need to change anything) you're good to go. Also, everything can be configured without the UI (not so easily of course).
AFIK they removed it only to move it to their paid version, didn't they?