> To use the chopsticks to pick something out from near the bottom of the dish.
I think there must be some bits that are lost in translation for some of these. This makes it sound like you can't eat all of the food in a bowl with your chopsticks.
Edit: In fact I think you're completely right - "picking out" something near the bottom of the dish does suggest that.
It is definitely rude to use chopsticks that you just put in your mouth to go rooting around for something in those. You are supposed to take from the top and ideally turn them around using the back end. Some people frown on using the back ends however as it may have been touched by your hand...
Edit add: It means to dig food out, either from your own dish or a shared one. Like mixing the food up to look for something you like in it.
To turn the chopsticks around when serving food so that the tips of the chopsticks that have touched one’s mouth do not touch the food.
However, the people that I learned etiquette from taught me to turn the chopsticks around. They were not low class by any means, company owners from Kyoto region.
> 移り箸 Utsuribashi (also known as 渡り箸 wataribashi)
> To keep putting the chopsticks into the same side dishes. It is proper etiquette to first eat rice, move on to eat from a side dish, eat rice again, and then eat from a different side dish.
More about politeness to other guests in the context of a shared meal than being picky (and probably also with some similar logic to the TCM theories of how and what to eat, and maybe giving face to the host).