I've never taken part of managing a track day organization, and I've never donned a shirt either...but I have done a fair number of track days and seen a LOT of interesting things. And one thing you always have to keep in mind is that the track day is bigger than yourself. What do I mean by that? I mean that your view of the day is only a small scope of everything involved. Put yourselves in the shoes as if you were running the show. There were a lot of red flags Saturday morning. So had they not backed things down a notch, instead of you complaining about checking up on a large group, you would have been complaining about the lack of track time because of all the red flags throughout the day. Now, maybe not you in particular, but I assure you, somebody would have complained about it. It's happened plenty of times in the past.
So which outcome is better for the whole? Taking it back a notch, or just letting everyone crash out? Taking it back a notch. Why? Because it resulted in less red flags, which means less crashed bikes and less ambulance rides...and more seat time for you.
Having gone "full circle" - going from a novice rider that complained about liter bikes killing my 600 in the straight and I can't pass, complaining about no corner passes, then onto complaining about how you can only pass on the outside in intermediate, to finally riding in "A" group - I can assure you that they are all hollow complaints. They were never a problem to begin with, the problem always rested with me. It was me that didn't have the skill to pass the liter bikes on the brakes, and pass them that way. It was my fault I didn't learn how to start setting up a pass in a corner, only to time it so I passed him on the straight out of the exit. It was always on me, and the fact that I just didn't know how to get properly set up to do what I wanted to do.
So what's all that mean? There's a reason people are in Novice, Intermediate, and Advanced. They will always tell you that speed is not everything in Advanced group. And they are correct - but you'll never see a fast guy that doesn't know how to set up a pass.
My two cents for you to take to your next track day: Talk with a CR or one of the staff THE DAY OF, and tell them what's on your mind. Don't wait until everyone has gone home to complain about it online. Show a CR a wheel if they aren't looking back and you want to pass (Hint: They're probably not going to look back if there's a standing yellow flag on track...since that means no passing, right?!). And when you're caught up in those moments on track when you're forced to slow down, for whatever reason - use that time to really hone your body positioning, turn in points, learning where the bumps are at on track, etc. You cannot work on all these things while riding at 100% of your skill set. It's just not possible, and you will end up half-assing a little bit of everything, which eventually ends up with you sliding along the pavement.