I would say that the size of the building does in fact matter, especially of non-fireproof construction. A fire in a 3 story wood frame, rescues can be facilitated from portable extension ladders (and you typically see such in the more “residential” outer boroughs.). Once you exceed 4 stories though, portable ladders are ineffective for the roof and upper floors.
Then let’s downsize the trucks in those areas of the city,easy enough right? Not so much. The fire department is built on redundancy and the ability to interchange units throughout the city. A truck in Queens could quite easily wind up responding to a fire in the South Bronx.