One more feature to enhance is using buffers to describe the affected area instead of bounding boxes (envelopes) in changesets. This approach eliminates the disadvantages of “huge area” changesets that cover the entire map when one feature is in New Zealand and another in Anchorage, Alaska. Instead, there would be only two buffers around the changes, not the entire world. Consequently, this would significantly improve the History tab.
UPD. This idea was already mentioned in issue #756 weeklyOSM. https://weeklyosm.eu/?s=improving+the+process+of+forming+changesets.