MINE | MERGED | THEIRS
where you can select elements from both and have them merge into the middle.Or the p4 merge way of:
MINE | THEIRS
-------------
MERGED
Even most GUI's for git do it this way actually.Merging should not be a major issue, it should be a trivial annoyance.
It shouldn't drop you into an interactive rebase that invalidates every object after it (necessarily).