The 3 is a bit of a lightweight on weight carrying capability, circa 400kg occupant and cargo limit - thats not even 4 adult rugby players... imho the Y is going to have to improve on that otherwise all the extra capacity may well go wasted.
Yeah I don’t think most people worry (or even know) about that and might be surprised when the car doesn’t perform well when they have 1100 pounds of passengers and another 100-200 in luggage/cargo.