(Some) Macs have no Del button. That means there is no quick and obvious way of deleting selected peaks. It can be cone with Fu7nc[Backspace], but that is not universally known. It would be better to add [Delete selection] or [Delete Peaks[] to right mouse menu, where anyway it used to be in V2.
The Del button methodology (so having to use the fn key) is the same behaviour as in v2. I'd say this is not a bug but a feature request.
OK, it is a feature request. But I think it is significant that we used to have Deleted as a right mouse command as well (at least that is what the user told me) but do not have it any more. That does lend it a bit of urgency.