Regarding the 'engine cut-out when bus doors open', I assume that feature is the same as the "Stop Start" feature on many modern cars, and is designed to avoid wasting fuel by idling the engine. Modern batteries, especially on hybrids, can easily cope with the extra load (and the engine doesn't cut out if the battery is low).
But I suspect I am not alone in being conditioned to expect a long wait if we hear a bus engine stopping - traditionally it means the driver is going off shift and we'll be stationary for up to ten minutes waiting for another one to saunter up to take it over.