It also means not the car was previously ok, realistically may be, even if not in accordance with the prototypical.
Basically, this is just harmonization of laws of control. You can get used to almost anything and adapt to, also to defective cars where the control is not impossible, but the fact remains it does not exclude strange driving behavior and a defect.
This could be a worn out steering for example, you still would try to keep it under control unlike without a defect but it would be possible if any of the damage is not too great.
The King Michael S. ( i hope he is doing well ) droved once on 3 wheels, not fast but safe.
Another simple example of, your private vehicle has worn out damper, you would adapt your driving style to it, if you can, and it would be realistically but that does not exclude strange driving behavior and a defect.
This means the sim vehicles may have sometimes defects due to faulty design or lack of data, or whatever, and i'm of the opinion that this is absolutly normal for a WIP simulation in a scientific art, but i do hard when people disagree with all the power they have if one claims something is wrong with the car when they actually have no idea what they are talking about, but than the developer comes up with a update.
Maybe it wasn't defect or broken, but it seems it wasn't right before. Can you agree with this, that there was something not right before, no matter what reason, lack of data, defect, faulty design or whatever ?