Smoke damage is covered and it is extensive
Smoke permeates fabric, clothing and electronics well beyond any burned area, and the restoration cost on a household’s soft goods is substantial. It is a covered peril on a renters policy, and it is the most likely way a neighbor’s fire becomes your claim.
The water used to stop it does its own damage
Firefighting water runs downward and sideways. A unit below or beside the fire can be soaked without ever being touched by flame. That is covered too, and the two together frequently make a total loss of contents without a single scorch mark.
Displacement is immediate and often long
A building with fire damage is closed to everybody in it while it is assessed, not only the unit that burned. Loss of use pays the additional cost of living elsewhere, and in a building-wide incident that can run for weeks.