So this used to happen on Dublin Bus, but a while back they solved it with an astonishing innovation... a second door! You get on at the front and off at the back. Given that this has been common elsewhere forever, it's unclear why it took them so long, but...

(Bafflingly, they went through a transition period where ~all of the buses had two doors, but the driver rarely opened the back door. It wasn't really until covid that using the back door became standard. Improved things greatly.)

> and jockey for position and for a seat before the bus can start moving again

Do urban buses where you are require people to be seated? Didn't realise that was a thing anywhere. Any (urban, non-intercity) bus I've ever been on takes off as soon as the last person gets in.