To be honest, I agree with you. But T10 will be adding cars anyway (probably) and I think getting the hottest contemporary race models - F1, LMDh/GTP, GT3, etc. - is their chance to gain some attention and boost stats of the game. But I’d prefer to get them for free ofc 
That’s also true. I have many such cars on my list. Especially Porsche 935 '19 that was supposed to be in Forza Motorsport from the beginning, it’s even featured in the intro…