Comment by vkazanov
Only somewhat related: I was surprised by how simple and sound vietnamese grammar is when read through the latin alphabet. Tones are only a problem when speaking but it's increadibly easy to start understanding signs and labels in the country. Slavic and baltic languages i can read are MUCH harder to start with.
So i kind of suspect it might also be the case for chinese: tones and the alphabet are obscuring a clean grammar.
Conveying what I've heard from a few Vietnamese that also speak Chinese, so not any kind of firsthand experience since I speak neither: Vietnamese is more difficult to speak but is a simpler (less expressive) language.
I agree that written Vietnamese is relatively straightforward. It isn't that difficult to read to the eyes of someone used to latin script.