I bet it's because of the way they do crowd congestion. Groups behave as one unit in their fluid simulation so maybe splitting them up messes with how that functions and behaves. Hopefully this is something they'll be able to fix down the road.
Early on I f I remember correctly, in an interview with the guy that developed the peep flow system, each group is attached to a particle that flows along the path system. When a group sits on a bench, the particle parks, and the peeps animate in relation to the particle. This caused me some concern, in regards to the ability to break peep groups.
I also noticed that when you change the number of cars on a train, or change the load rules (half/full) you see the peeps in line reorganize themselves possibly to the new rules, or number of seats available. I'm speculating. I have no confirmation that that is what is happening. But that's what I suspect from all the clues. This is why you very frequently have empty seat on ALL rides. The spinning coasters were the biggest tip off. Also when I think you reported the problem when the new Gnarler allowed one two seat car!
What this suggested to me was water slides would be a big problem. Also why we have yet to see flat water rides like the two person swan boars, jet skis, canoes, etc. Two seater chair lifts would be out as well. They would have to be four person gondolas.
When I saw the sneak peek of the Hoax track ride, I was curious how they solved my perceived problem. Interest solution at that! I can image a water slide could work similarly. A group of six would all just get in the slide pipe all at once, and their release would be spaced out, just like the Hoax.
I do wonder if the group particle also gets "attached" to a coaster train, or if it waits at the exit, and something else happens while peeps are riding and then regroup and reattach to the particle. But if that were the case, it would negate my hypothesis.
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I would love it if Owen McCarthy could give some insight. He did another great Q&A on the forum during Alpha.
Here is the article:
https://medium.com/@nicholasRodgers...tion-scenarios-in-planet-coaster-9b5743bd805c