I'd say most are ignored in most settings.

Having spent 2 years teaching English in my late 20s, most of these rules are "common sense", just like "Don't spit your gum out on the bus floor".

Passing food between chopsticks? Come on - someone giving you food will put it on your plate. I never had that happen. Who the heck washes their chopsticks in their soup? Utsuribashi is a ridiculous one - nobody is policing your intake.

The serious ones are pretty real though. Funeral settings may set food out for the dead, and you see the chopsticks set that way too.

I have seen many versions of these over the years, and most of them do not give a why, or an alternative.