As much as i would like to agree with you, it should be a simple problem and there should be many comparable alternatives available, i can't because frankly all of the free clients in the wild suck in one way or another. I've been looking for years but everything i tried either looks like a cheap hack made with TkInter or lack one or two vital features. One might have a good branch viewer but lacks interactive staging, another client the opposite, etc.

I haven't tried gitkraken though, maybe it sucks equally much, my point is that there is an open market spot for good git GUI.

I have yet to find a single Git Front end that allows drag and dropping of branches. Feel free to enlighten me.

While not perfect, it does help that it's free for non-commercial use