I think the craziest excuse is from the guy insisting that a child will become mentally underdeveloped from rear facing because they aren't being visually stimulated enough. Come on now! Are they just making stuff up or what?
I do think some of them have a good question though and it is one I have wondered but always thought was too dumb to ask. Why not just make the whole back seats of the car rear facing? There's some way they could do that right? Stupid or not, I'm still curious about it lol.
Another thing, why not make adjustable seat belts that will fit a child or small adult? Is it that hard to just install mechanisms that do that? There could also be a mechanism that adjusts the actual seat to fit to a child, so that their legs will comfortably bend at the edge, and they wouldn't slump. So adjustable seatbelt plus adjustable seats to fit children that would normally go in a booster. Would that cost more or less than manufacturing actual booster seats? (legitimately wondering, I am not trying to be sarcastic)