This is 10000% true - both Mariachi performances were total energy drains. I like the Mariachi's in the 4th quarter of the Sam Houston St. type games, but it is way out of place in any kind of intense game atmosphere.
I understand and embrace the entertainment aspect of the stadium experience. I know it isn't for me and, for the most part, I neither enjoy it nor am particularly bothered by it. I also go to most away games. Other than the OU and Michigan experiences, every place does it more or less the same. There does seem to be a bit of competition, wanting to be the one with the newest or latest gadget. DKR seems (mostly) ahead of the curve on that with the drones and lights and such - though UGA had this coordinated wrist light things that produced a pretty remarkable light effect during timeouts.
I realize this is probably too much to expect, but I wish there was more flexibility/adaptability. I understand there is probably a script that is produced ahead of time that they follow, but it would be great if there was more of an ability to read the room, so to speak, and make snap decisions on what will best work. The mariachis went over like a lead balloon early in the game - I know it would suck for them to get cut later, but rolling them out again later was a disservice to the team/stadium. Knowing when to stay out of the way, or when to do a crowd favorite. Is 4th down coming up? Did they just give up a long TD and need some pumping up? Is momentum building to a crescendo? There needs to be more adaptability.