[Chathamization]

Being able to write a character by hand, being able to type it up, and being able to read it are all different things. I doubt many Chinese would be thrown off from reading or typing 打喷嚏.

I actually did a deep dive into the issue of unfamiliar characters coming up when reading, and how people handle them. I won't go into all the details, but the general takeaway is:

1. Unfamiliar characters can actually be quite rare or quite common depending on the material you're reading.

2. It's not much of an issue for people either way.

[adrianN]

Of course, when I used the word „write“ I meant writing by hand.