Yes, STX MW can never be as good audio qualty as other forms of Broadcasting - but just one transmitter gets the signal much further than the alternatives & in a Car or truck, with the road & engine noise factors, do people notice the difference in audio quality? I doubt it.
Once everyone is brainwashed, into buying an Electric vehicle - at huge cost, I guess MW will be needed much less, as I understand that because of the hash created within them, MW reception will be impossible. Not that I've noticed it, when driving near EVs myself, in my non EV - Fridge trucks, yes - kick up some interference to MW - though it's not a major problem.
Perhaps anyone with an EV can confirm or deny this.