Restricted spread of information caused about of month of delay for proper action, as facts were concealed and suppressed by local authorities. If proper action could have been taken in mid-December instead of mid-January, then the spread of the infection could be heavily limited back before it had grown to such large scale as it has now.
Exactly. I read on twitter around Dec 31 that there was such a virus spreading in Wuhan. Around Jan 1, the Wuhan police dep publicly condemned 8 person (the origin of the twitter news) for spreading this information and called it a rumour. Then the gov did everything to hide info and did nothing to prevent its spreading before around Jan 2x. They behaved even like they want to spread it as much as possible because just about two to five days before they made the announcement of the virus outbreak, the Wuhan gov organized a so called 40k family new year banquet -- around 40k Wuhan local families were concentrated together to have a banquet to celebrate the coming Chinese new year. All the events I cited here can be found on China's own newspaper and tv recordings.