The boarding group system is a flawed execution of a problematic concept with a massive bias towards repeat visitors and the technologically literate. If it’s going to come down to a lottery, make it fair and open access. Don’t require your guests to have to interpret your own rules... which require arrival prior to the published park opening time, essentially require smartphone and app integration, and being aware of and hitting the right button within an 8 second window.
I saw this happen firsthand back in January. Nice elderly couple, wearing matching tennis type outfits, meandered over to the ride entrance. They were clearly interested in the experience and tried talking to the CM about riding. She couldn’t help, obviously, and tried explaining the reservation system. I could tell they were confused and disappointed but not emotionally so. I feel for people that just want to experience the parks and don’t have the tech savviness or the desire to keep up with the “rat race” aspect of things.