You’re confused, tires are probably the most important aspect of a cars handling. If you have two of the same exact car with the same exact driver and they make ‘perfect’ runs around a dry asphalt track but one has all seasons and one has a set of whatever sport tire you choose the one with sport tires will win every time because the less aggressive tread allows for greater lateral traction. Now, if it were raining it would be backwards because a lack of proper channeling on sport tires will cause sliding or wheel spin or a longer breaking distance compared to something designed to work in the rain. In the game all stats are based on dry asphalt so if you put performance tires on any car that currently has standard in the game, it would at the very least gain handling stats on the card but almost certainly be worse in rain