I don't really care about realism but I care about coherence. Comet Sun is a big but normal bus with 29 seats (1 floor only). Why would I want to replace it with a huge articulated bus (Nova SA) with 25 seats? It doesn't need to have real life capacities or even related to real life, like real life - 30%. It just need to be coherent compared to the vehicles of the game. And rulesets doesn't help in this case.