The other thing I found kind of customer-unfriendly is their
https://news.china-airlines.com/emer/info_en.aspx webpage basically said we will follow the Contract of Carriage ("“strike” is a matter beyond the control of the airline...").
It is kind of bad to quote legalese when the passengers are suffering. How much flexibility do the agents have rebooking passengers - especially if it is not a CI issued ticket (seems even on day of travel)?