(Am still trying to come to grips with anyone calling themselves 'Smelly Tofu'!!! Chuckle).
I have, not only a bright yellow scooter, but also a bright yellow car, and am often 'not seen' in that! I have no idea why people cannot see a bright yellow car approaching, but they still do all that rubbish they do ordinarily, when a less-obvious car might approach. I've had so many near accidents, and simply drive away shaking my head and muttering... "It's a bright yellow car!!! How could you not SEE this?"
Maybe it's less to do with what they physically can/cannot see, and more to do with the general lack of common courtesy on the roads (and in society at large). We are a world of instant gratification, and often great selfishness. Being polite and courteous, putting others first over our own needs, is very often not a priority these days. How often do people wave a 'thanks mate' at you when you let them into your lane? Used to, rarely now. Or who, these days flashes their lights to warn of 'police ahead', or remind an oncoming driver to put on their headlights? Not very often, but it used to be the norm.
We need to learn and exhibit care for our fellow man - that's it. Visibility is important, obviously, but taking care with other people's lives is paramount.
Don't take life too seriously. You'll never get out of it alive.
2011 - Pearly White Kymco Like 125cc
2012 - Giallo Lime (yellow) Vespa GTS 250ie
2016 - Shine Red, Aprilia Scarabeo 200ie