Tell me why the hell do trucks kill so many people in isekai? At least use car accidents. Also, why do people have to be crossing streets to be hit? Please make them in a car being hit. Honestly, this is a bit of a rant, but I hate the hell out of the damn trucks now. Why does God somehow accidentally lose control of a truck and kill someone? Can't people make it a force of nature like lightning or a volcano? Why does no one do the trope where people get rewarded for doing good and that's why they get isekai'd? Also, more people die in car accidents than hit and runs sooooooo, please if any of you do isekai make them die in a damn car crash.
I think the reason the victim isn't in a car is usually because the character doesn't own or need to drive their car. NEETs, office workers using the subway, so on and so forth.
Also small technicality: hit and run implies the driver left the scene, but usually the victim dies before we find out that the truck driver stayed to try and save them or whatever. Doesn't have to be a criminal act, just an accident.
Still, I think it's mostly just a meme. It's a cliché that's easy to use and mostly harmless, so people use it when they don't care how the character died. It's meant to be read and either snickered at or flat out ignored. 'Oh, the character died, what happens next?' Not, 'Oh great, another meeting with Truck-kun...' If you noticed it, it's either bad writing or you're overthinking it.
I will second the advice to try something different, though. Not caring how the character died is fine, but caring gives you a chance to improve the story.

I don't think making it a car crash would be a noticeable improvement, though.