The tightly scoped PR stunt restrictions is basically how the game was at launch, and I think players grumbled enough that the restrictions were removed for a long while, but now they're coming back in again because Rimacking everything gets boring (like FH4's weekly V12 Mosler session was). I don't mind the restrictions to be honest, so long as they're doable with an unmodified car then it's an excuse to drive something I normally don't for a few minutes.
The rough ones are when the only eligible cars are low in a class, and the targets are set as if the car is tuned to high in that class, making it very hard or impossible to do without wasting time throwing on upgrades. Recently an Xpeng one and a speed trap with TVRs in the rally expansion sand dunes were really bad for that, but in the past it was usually still possible to do them stock outside of a few rare cases.