Funnybear, your stance on this issue is somewhat tempered by your repeated comparison of an FXO to an FZR. Yes, an FZR is faster than an FXO. I should bloody hope so. An FZR is also far faster than an FXR, which shouldn't always be the case. It should depend on the track.
But with regards to class balancing in general, there are two sides to the issue:
Side one is that LFS isn't finished yet - there are many more features to be introduced to LFS, for example unique aero characteristics, undertrays, tyre compounds, gearboxes, better differentials, etc. All of these can be used to help balance the classes, and as LFS is in a constant state of development, it wouldn't make sense to fiddle with things now when future developments have the potential to radically change everything.
Side two is that although LFS is a WIP, we're playing it and bankrolling the development of it, and thus we expect the gameplay to be maximised in the short term. This means making the extra effort to balance the cars with the current physics package, in order to maximise people's enjoyment of the game as it stands.
I can see the logic behind side one, but have to agree with side two. The class imbalance is spoiling leagues, and even rendering the in-game TBO/LRF/GTR filters useless, as more servers start to run RB4vsXRT (and no FXO), or XRRvsFXR (with no FZR).
The LRF class is so unpopular that it surely can only be considered a failure compared to the other classes. I keep wanting to drive this class to gain some experience in it but can never find any populated servers running it. The RAC, being a real car, is sort of the benchmark, but the FZ5 is a pig to drive and is outclassed by the LX6 even on the higher speed circuits, which surely isn't right. If the more difficult FZ5 can't outpace the easier LX6 on the higher speed circuits, then what's the point in driving it? Same goes for the XRT vs FXO, and XRR vs FZR.
Please Scavier, balance the classes. Pretty please. Spend more time with the beta testers to find the correct values for each car. Surely that's one of the main advantages of having fictitious cars, that you can tweak the values as you wish? We're all bankrolling the development of S2, and people are trying to run leagues but finding them severely compromised by the dominance of particular cars; public servers suffer the same effect with less long-term consequence but more frustration for those that want to drive more than the FZR or FXO.
In the absence of any imminent physics updates, the class imbalance needs fixing in the short term, imho. Just a statement from Scavier regarding their opinion on this would be a most welcome start. But this issue has always dogged LFS to some extent, so I'm not getting my hopes up. But I'd love to be proved wrong...