That is not your main mistake. The main one is that you re not logical. The subject is about "why noone but V is riding a motorbike?". In Night City, you dont see people with bycyles, skateboards, rollerblades either. But this is not the subject. If I d wish to nitpick, neither I could have enough time to post all, nor you to read. There are few things one should never argue about this game. One of them is that the work has become sloppy. I m sure it didnt start that way. But it ended as it is right now; a giant bundle of bugs, glitches and a mindblowingly stupid AI. Well, you may call it "nitpicking", but I find it extremely disturbant when I see 5-6 motorbikes side by side, surrounded with some gang members, nearly all around the city (and definitely much much more than 15) and none of them, not a single one of them is ever riding a bike. Yes there are much deepers issues in this game. Bigger problems to solve. Hell! Some of the bugs are breaking the game, making it impossible to play. And they re still there even after the last patch. But in the frame of this thread/topic, I agree with people complaining. Eventhough you call it "nitpicking".
Ofc it's nitpicking, surface level. This pretty much only rheorical, when you willingly or not willingly ignore things like:
1) gangs specific theme cars: Valentinos, Technomancers, Tyger Claws, 6th Street, Moxes,Wraiths etc. you don't see these cars as part of traffic, same with bikes owned by gangs.
2) theres only few "civilian" bikes in game, motorbikes are not huge part of traffic IRL, so any traffic when you will see ratio CARS:BIKES different than let's say from 1:1000 to 1:5000, will be less or more artifical feature, it would be ok and cool to add bikes to traffic, but seeing motrobike every minute could be immersion breaking, 1:1000 (like IRL) is already insignificant, that's why many people don't have problem with "no bikes in game!" (but based on one post and screenshot they are somwhere around, but really insignificant...just like IRL) or don't even notice it, because it's similar to RL.
3) making gangsters and their cars,bikes significant part of traffic, would make it very artificial, gangsters are not huge part of population of NC, theres few thousands of them, according to lore and NC population is 6 M according to Wiki ( so not 2-3 M as i previously said).
4) making gangsters doing crime around every corner in NC is already a little bit artificial, but it's nothing new in video games (in Fallouts majority of human population are Raiders, nobody complained , because it's part of entraininment to shoot them) no need to make their presence even more artificial, it will add nothing to game, only making it some kind of theme park.
Then again let's willingly ignore lack of taxis or buses in traffic (and they are bigger part of traffic IRL than motrobikes)...because you know most people can see difference between bikes and cars, " lack of taxis!!!" won't spoil their fun...
Same thing was with weather system. Weather system was perfectly fine before last patches. Rain was rare, sandstorm were rare, toxic rain was very rare, it made them very significant,special when they happened, plus it was logical part of worldbuilding. After last patches they added more rain, I think to show how surface reflections were enhanced. So it's raining not every night, but every two nights, even when whole area around NC is desert... for some reason NC is closer to London than to LA, right now. Plus some people whining "no rain in game!" still can't see it, lol!