Does it matter what type of resort you are staying at ?
DME still delivers to the room all your checked luggage if you are at a valie or moderate ?
I would assume always delivered to your room at a deluxe - you pay for it with your room price(no offence for deluxe people - we are one of them, now trying a moderate - money issues)
The value resorts, not sure about the moderates, doesn't really have bell services. They have CMs who deliver bags to the rooms. I'm not sure if they deliver once an hour or twice an hour. There is a delay between when your bag arrives at a value resort and when it gets delivered to your room. The time I stayed in POP I had to wait for my bags. I have no idea how long, I went to a park.
DME is a free service. I can't see Disney spending the money to program the system to send guests text messages.