How is it helpful to have more concepts and commands that simply duplicate advanced functionality and have to be used every time complicating even the simplest

How is it helpful to have more concepts and commands that simply duplicate advanced functionality and have to be used every time complicating even the simplest cases? As you said it can all be done with amend and other normal and optional commands already. Or you can use an easy-to-use but powerful UI like TortoiseHG, where it's trivial to check files or hunks for commit, stash (shelve), amend, revert, rebase, ... TortoiseHG with hggit is the best git client. And that's before even mentioning the best parts like phases and obsolescence markers.