Some of the truckies in this group can answer better than me, but I think the Brontos have at least two problems that really turn FDNY off . . . the size of the apparatus would make it very difficult to operate (and position) on NYC streets, and the spread of the outriggers would make them hard to set up just about anywhere in NYC.
FDNY experimented with 150 foot European-style ladders in the late 60's (High Ladders 1 & 2), but gave up on them very quickly, and removed the Magirus ladders in favor of 100 ft Groves.