I drop my phones about once per year so I need a case to protect my phones but a simple bumper case is not enough with these curved displays and depending on how the phone lands, screen might shatter even with a good bumper.case. The cover cases also prevent damage from typical day to day usage.
I have seen some really good implementation of always on displays with smart cover cases, especially from Samsung.
I cannot recommend the case I linked, I don't have it yet and I do not expect much from the case, it just happens to be one for sale now, I think beat cases typically don't get released this early. If anyone sees a good cover case, please post here, also if you see always on screen mods for the phone.