When Assetto Corsa was announced to be coming to consoles, all the PC guys and many websites were warning people - this isn't like your typical GT or Forza game. No car collecting. Extremely bare bones in Career Mode. Very limited car & track count compared to the typical console games. They're a tiny studio and their philosophy, while not for everyone, is to provide the most realistic driving experience they can.
Whether you're cruising along at rookie Track Day pace in an F40 or all-out racing a GT2/GT3 car at Spa Kunos has tried to make it so there are no compromises in those departments because usually one style is better than the other (street car vs. race car). That's one of the main reasons why they have such limited content. The cars are way more complex than you'll find in your typical console game.
Everything comes with a price, a trade off. Especially so on the console platform we are learning. Much less customization players might be used to. Much less everything, but it IS still there. GT6 loved to spout that "1200+ cars" comment. Assetto Kunos like to brag about ridiculously detailed cars with highly complex data behind the physics from working with the manufacturers directly on pretty much each car & they also feature laser scanned tracks.
I'm not necessarily saying that the OP is completely doing this, but he is to an extent: Why can't Assetto Corsa be more like GT or Foza or PCars with... (insert issue here), or "Assetto Corsa should do (insert thing here). All the games have that..." Some PC sims don't even have a Career Mode at all. I know for a fact, many PC players of Assetto Corsa have never, ever done a single Career Mode event. Maybe Assetto Corsa is doomed for failure on the console because those features/options aren't available to them. I'm not saying wanting those things in AC is foolish, or AC is 'too good' for those things. Not at all. It just doesn't seem to be in line with their philosophy.
Having said all that, the OP could still run the exact type of race he prefers, down to the exact number of laps. It doesn't have a screen that pops up and says "Boy...You're really making progress now! Let's see if you can handle the Ferrari FXX-K on Vallelunga in a Time Trial next!!!" No fireworks will go off to celebrate the completion of Career Mode. I have a huge question for console users, "If Career Mode is so important, what do you plan to do with AC when you finish Career Mode? Uninstall it?"