I have never been given the "full details" that you spoke of above prior to going on a ride. I am going to find the faster riders and ride with them. If I can't keep up, it will not be the first time nor the last that I am dropped. Being made way more complicated than it needs to be. Maybe that is just BF

My ride this weekend with a group is approx 60miles, and 8000 vertical. That tells me what i need to know as well. I also use average speed on solo, repeat known routes to compare my progress during the season.