[tgb]

I think you're overstating the complexities of pinyin, even if Zhuyin is better. The context pinyin requires is extremely limited, being exactly only the rest of the syllable. It's simple if one just thinks of it as a set of initials/finals and not as letters. The whole thing can be learned in a day, so there's not much to be gained in an improved system.

[AlchemistCamp]

I regularly meet people who have been using it for months and still keep using the wrong vowels.

It's not insurmountable by any means. However, if Pinyin came in on a code review, I'd have a lot of comments on it :D