The problem is that most speakers were never taught how to use these systems. Most people only learn Pinyin and written and spoken Standard Chinese in school.

The problem is that most speakers were never taught how to use these systems. Most people only learn Pinyin and written and spoken Standard Chinese in school. Cantonese survives and is thriving because it dominates as a spoken language in education and in public. Even so, only few people are familiar with any of the romanization systems for Cantonese. In Taiwan, Hokkien and other languages are not so established, and were even suppressed for some time. Therefore, it's not so surprising that even fewer people know about writing systems for these.