Seconding others here, what you're bringing up as distinct features of Gitbutler seems to just be stuff git can do.

- One local copy of a repo with multiple work trees checked out at once, on different branches/commits? Git does that.

- "Add a patch to any commit in any branch" I can't think of a way of interpreting this statement (and I can think of a couple!) that isn't something git can do directly.

Maybe it adds some new UI to these, but those are just git features. Doesn't mean it's a bad product (I have no idea, and "just UI" can be a good product) but these seem to be built-in git features, not Gitbutler features.