Pd uses AI to adjust bops. Thats why All cars were horrible unbalanced at the launch. They fixed every other class except N.
Did they? Because it sometimes still feels like some cars in the other classes continue to have an unusually high amount of usage. And some seem less viable, like the Group C cars within Gr.1. I still think they should try having "sub-rulesets" for some of the classes, where on top of being limited to a given class with BoP enabled, they could limit the player to use certain cars within a class. That could make things interesting, almost like making Sport Mode versions of the GT League events.
I did have an idea, for a future game. And I'm pretty sure they'll allow you to tune your car(s) more like you did in prior games, but I think it'd be a nightmare for everyone involved if they tried to balance cars with various levels of upgrades installed to be viable. So here was my idea. The N-series in a future iteration of GT Sport (and IIRC the next game will feature Sport as a separate mode of sorts) could really emphasize the fact that the involved cars are stock, and only allow cars that have not been modified by the player. However, the player can upgrade a car to make it a formal Gr.4, Gr.3, etc. car in a fashion similar to the RM game mechanic. Or, maybe these more typical upgrades could be one of the things prohibited if tuning is disabled, and if you'd added parts to your car, they could either be taken off for you to re-install later if you want, or your modded car will not be eligible to enter. Perhaps tuning being disabled could also prevent a race from allowing "N-series migrants" like the F50 within N300, and would only allow an N-series to permit cars that would be in that class as stock, before BoP is applied, and BoP would not take the car out of its initial class.
And on top of that, I'd also put the Toyota S-FR Racing Concept in Gr.X, as it's a concept race car. (It even seems to come with center-lock wheels.) I'm otherwise fine with concept cars being in the N-series, like the normal S-FR, the RX500, or potentially the FT-1. I wouldn't mind the S-FR Racing Concept being bumped up into Gr.4, though. It'd actually be sort of neat, since Gr.3 already has the GR Supra Racing concept.
I am also curious, though, as to why it feels like some track-only cars are added to the N-series and others are added to Gr.X? I recall that the Zonda R and P1 GTR were added to Gr.X, yet the Vulcan is in the N-series. Perhaps PD made this decision post-launch, to add track-only cars to Gr.X? I wonder if this is also why the Vulcan has its braking & downforce issues, like it's "dumbed-down" for the N-series...