As an engineer (mech and industrial) things happen. They just do. But it’s the safety reporting processes and flagging systems BY THE CAST that should catch this. Calling a phone in the cab for a door open while going between TTC and Epcot would solve NO issues. That being a default response points to incompetence at some level(s) of WDW transportation.
Actually, if someone did pick up the phone and call would have probably resulted in an e-stop mid course and a lengthy wait for everyone while they evacuated the people out of the car or fixed it. Probably hours. Pretty sure if I'm ever in that situation I'd be pissed at anyone who called instead of just making sure everyone got away from the door. lol