We also partly ended up with the 5k 5090 because it’s just the TITAN RTX of the 50xx generation - the absolute top of the line a card where you pay 200% extra for that last +10% performance.
nVidia just realized few generations back that naming those cards the xx90 gets a bunch of more people to buy them, because they always desperately need to have the shiniest newest xx90 cards, no matter the cost.