Am I missing something here? How do you get into a detached HEAD state without explicitly taking an obviously weird action, like finding and checkout out a commit hash instead of a branch, and why would it make sense for git to not be in a detached HEAD state should you do that?
Most people don't think about doing a hard reset to the last good commit, and then soft resetting to HEAD~. Instead, they just "git checkout $LAST_GOOD_COMMIT". And afterwards they may even continue by working with a detached HEAD
But this isn't an obviously weird action? It happens all the time when you need to branch off from a previous point.
Maybe you're unexpectedly releasing a hotfix, maybe your current development is going in a bad direction, maybe you need to test something against a previous state.
Several times that I've helped junior developer out of a detached HEAD state, when I asked what they thought they were doing before it happened, the answer was "I was just doing my normal rebase before..."