You can't use the remote reflog to revert what you force pushed, can you? But I agree that having your local reflog means you're never totally lost. I still just make a branch before major edits so I can go back.
No, but you have local reflogs of remote branches, and if you --force-with-lease you are guaranteed to have the old state stored there.
You can often also access equivalent functionality by platform APIs. For example, GitHub has event API which you can use to check what a ref has pointed to previously.
