From what I hear GT has a pretty tedious career mode but that is about game design, not driving realism. Forza walks a pretty good line letting you jump ahead as long as you can afford cars in the class. But yeah, when I do want to go nuts I generally spin up Carmageddon 2 and smash into all the things.
For me, I enjoy the subtlety of driving games. It’s easy to have an existential crisis about the absurdity of driving around in a circle, but driving isn’t about that. Driving (especially simulation driving) is about the challenges of finding grip in corners, breaking at just the right time, and putting on as much power as possible without spinning out. Good racing games are a delicate balancing act between various forces and conditions. Finding that balance is rewarded with a good time.