I think it's definitely possible to create a better CLI than git, however I think the majority of what unhappy users of git are imagining when they ask for a be

I think it's definitely possible to create a better CLI than git, however I think the majority of what unhappy users of git are imagining when they ask for a better UI would oversimplify things and end up removing a lot of valuable capabilities. These capabilities may not be suitable for a non-technical audience, but I believe should be table stakes for professional software developers as they are very sharp tools for managing the software development lifecycle that transcend specific languages or domains one may be working in. To take your example of moving commits between branches, the git rebase parameters and --onto flag are definitely confusing, but each of them is clear and necessary when understood. The CLI could be refactored to be clearer, but the hard part is understanding what each one means, which you would need to do anyway even with a better CLI. Obviously one can work around these knowledge gaps, but once you understand them they are useful for an entire career and the warts tend to fade in importance relative to the value of a tool with the insane power-to-weight and rock solid architectural tradeoffs of git.