Crazy Voyager, if you're missing something then I am too...
As a pilot, I am taught that "Standby" means to not transmit until I'm called. The response to an instruction to standby is nothing. No "roger" or "standing by" or any of the other dribble you commonly hear.
In my mind, the instruction "STANDBY FOR MAASTRICHT ON (CHANNEL-NAME)", is mixing up the instruction to monitor a frequency and to standby. Its fine on paper but when you mix that up in a busy congested frequency you're just asking for trouble. A standard "monitor {channel name & freq}" would be far more appropriate.
With regards to the risk of selecting the wrong frequency, I don't think this system is significantly more risky than other systems, as the likelihood of selecting the wrong frequency is about the same, and then if I'm on the wrong frequency, I'll clue onto it eventually and go back to my original frequency...