When a leader goes off on vacation while some event happens, it puts off the impression that the government is ineffective and out of touch. It undermines the people on the ground who perhaps are doing something.
Also, in terms of "What would he have done for the fires", there are any number of things. The gravitas of having the man on top demanding action ensures that things happen quickly. As a trivial example, if the Assistant Deputy Commissioner of Brush Fire Extinguishing needs X, he'll get it when the truck or helicopter is available. When the PM needs it, the truck or helicopter is made available, period. Or it could be as simple as giving some sort of speech in your crisis windbreaker to rally the troops.
I do expect him to show leadership in times of crisis, bring unity, and just ‘be there’, especially when so many volunteers are fighting the fires and his countrymen are dying and losing their homes.
Bringing that lump of coal into Parliament was a declaration that he wasn't going to care if Australia burnt to the ground so long as he got his share of the coal money.
https://www.theguardian.com/australia-news/2017/feb/09/scott...
https://www.theguardian.com/environment/2019/mar/29/chinas-p...
Your argument is pretty awful.
It doesn't mean you're fighting the fires but it does mean you're staying informed, keeping people motivated through long hours and bad news and ready to make difficult decisions.
The PM isn’t going to do much of anything at this point. The time for the PM to act is prior to the fires starting.