Mfr's need to sell the car equipped with tires that match their advertised performance (stopping distance, handling, etc)... All season tires are compromised. They will always under perform compared to a summer/winter tire in the respective seasons, and they'd never run performance testing for a car in this segment on such a tire. Could they make the tires an option? Possibly, but that's a lot of coordination for a low-volume niche car. Best to leave that to the dealers to figure out, or the owners to sort.
I bought this car to use all of the performance it can give me, that means 6 months of the year I use summer tires, 6 months of the year I use winter tires. It cost me a whopping 1500 bucks to have an extra set of wheels with winter performance tires. That's less than 5% of the value of the car, and ultimately means that I am wearing my tires half as fast, so it's really not that big of a deal. Yes, it's money up front, but means that I can actually use the performance that the car provides. Tires are almost always the weakest link, why pick the most compromised tire out there on a performance oriented car?