Our buses are also less comfortable and "rattle" more that busses I've ridden in many other first world countries. I'm not sure if this is an economics thing but the standard New Flyer buses feel a bit dated.
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In the UK, there were always a few buses in any given fleet that rattled more than others, especially when idling or at low revs - something to do with resonance with the body panels, I think. But that was back when diesel engines were universal, so hasn't really been a thing since hybrids and (more recently) BEVs took over.
Looks like New Flyer hybrids use BAE Systems' Hybridrive, which was fairly common in London during the 2010s but didn't produce noticeably excessive vibration as far as I remember. Is there something different about how the engines are mounted in US buses, I wonder?
They said the driver can change gear (put it in neutral?) which reduces the rattle, and they are supposed to do this, but some drivers don't bother.