The Veneno was my prize car for getting silver in all mission challenges. I was pretty happy, because it's a rather expensive car in the game, and I never got to drive one in a video game (not in real life either, indeed).
I tried it on several tracks, and aw man, it was painful. The car is fast, yes, but it's a STONE! It doesn't steer, it hardly brakes, corners with kerbs are basically like playing Russian roulette...
So my guess is, even in real life, it's not really a track car; just a show-off car with extreme aerodynamics and outrageous fabrics and fancy materials to flatter their very exclusive owner - a quintessential supercar. So, basically, it's nice to own, not so much to drive. I'm happy to have it, not to drive it.
Maybe there's a tune that might make it work better (if so, please let me know).
Also, about VGT cars, I think they are now part of the identity of Gran Turismo as a franchise. Whether people like it or not, that's Kaz' will from a long time ago, and he and Polyphony Digital managed to give it birth, with real brands involved. And it's crazy to see some of these cars brought to life, like the Bugatti, which has a lot of the Chiron DNA (or is that the other way around?), or the Mercedes featured in Justice League. It's a real feat, when you think about it.