Forest firefighters are specialized in forest ops, so fighting the fire in the bush and doing what they can to stem the tide of the fire, working in conjunction with the water bombers. They do what they can with the fire in the bush, working fire breaks, mopping hot spots in areas so they don't reignite into a full blaze. They would do whatever it is forest firefighters do, instead of being used within the city limits of Ft Mac, fighting the fires there to stem the loss of property. Within the city limits you utilize the resources of city firefighters, who are specialized in structure fires, which were required in Ft Mac itself while the fire raged around and in the city limits.
And yes fuji, you are correct, Toronto doesn't have any water bombers, but I'm sure you already knew that. It's apparent that you don't know the difference in the what was required in firefighters in and around Ft Mac.
The guys fighting the forest fire have already said that there's nothing they can really do about this one. It's going to burn until it burns itself out or a heavy rain comes.
All they have been doing really is going to the already burned out areas and putting out the embers.
This fire is capable of jumping a kilometer wide fire break. Even if you soaked a kilometer of forest in front of it, it can jump that. It jumped the Athabasca river at a point where the river is a kilometer wide. It's so servere it's having atmospheric effects, creating lightning that ignites more fires.
They're just studying its trajectory and moving people out of its way. In a very few cases they are defending various specific bits of infrastructure, like putting everything they can into preventing the water treatment facility from being destroyed.
All those things require machinery and equipment more than people. Dumping large quantities of water and flame retardant isn't something you do with a bucket. You need aircraft.
Actually lots of fires like this one rage out of control, there are several more equally big fires raging out there. The difference is this one moved into a populated area while the others are middle of nowhere.
The most likely outcome is this fire eventually burns off in a different direction that nobody cared about, returning to obscurity to burn another few weeks of forest rather than houses.