Taiwan's "warnings" were redundant information already provided by PRC - they had no unique observations. Their first case of covid was imported on Jan 21st. They didn't know shit about epidemiological characteristics of virus outside of what was communicated between medical professionals until then. Even Taiwanese media thought H2H chance was low mid January, and Taiwanese CDC didn't believe evidence for H2H was possible to establish until after mid Jan. Any notion that Taiwan had anything useful to warn about in December is part of a _literal_ propaganda drive coordinated by Taiwan and Pompeo's State Department in late March / early April.
China cracked down harshly and sufficiently that countries that immediately listened to WHOs advice to test/trace/isolate managed to contain the virus well because very few cases ever made it abroad as seen in import cases statistics from many countries. Expatriation flights meant leakage was inevitable, but screening procedures were mostly theatre, temperature checks instead of 14day quarantines. The problem is very few countries listened to WHO's advice, and still don't.
https://archive.is/2AdyB
https://apnews.com/article/a0b22f45f0cbc8e83e7d496dd2e09556
China cracked down harshly and sufficiently that countries that immediately listened to WHOs advice to test/trace/isolate managed to contain the virus well because very few cases ever made it abroad as seen in import cases statistics from many countries. Expatriation flights meant leakage was inevitable, but screening procedures were mostly theatre, temperature checks instead of 14day quarantines. The problem is very few countries listened to WHO's advice, and still don't.