[yorwba]

> some hanzi are super obscure and even native Chinese have to look them up sometimes when wanting to use them, and gave the example of "sneeze".

喷嚏 is the example always used because it describes a common thing that is rarely written about, and there is no other, more frequently written character with the 疐 component that could remind people how to write it. So when handwriting, one might substitute 喷㖷 instead.

Most obscure characters are simply obscure because they refer to an obscure thing, like not being able to spell the name of a village you've never heard of.

And characters for non-obscure things made of obscure components are usually common enough that people get enough practice writing them. E.g. 藏 "store/hide" contains 臧, an archaic term for "good" that now mostly occurs in ancient idioms and as a rare surname. But hardly anybody seems to have trouble writing 藏.