Grammar at its best promotes clear communication but more often is used as a social tool of control and exclusion. When you are already talking to people within your in-group, that impulse isn’t necessary.
“Sneeze” or “喷嚏” is a pretty difficult word to write in Chinese in terms of number of strokes and its internal components. I’m not surprised people wouldn’t know it off the top of their heads. It’s like if someone asked you to spell “unnecessary.”
The graph is percentage of total production. You can see Chinese production ramps up significantly, which can presumably imply that US production as a percentage of total world production falls off, even if absolute production increases.
WhatsApp servers have been blocked in China forever. I lived there for 13 years and the only time I recall using WhatsApp without VPN was in the early 2010s.