Because in a private house the failed pipe is yours, and in a high-rise it usually is not. Aventura started rising as a planned waterfront city in the early 1970s and is now overwhelmingly vertical, so water reported in one unit frequently started in the one above it or inside a wall none of the residents own.
That uncertainty carries a second consequence: responsibility. Florida recognizes a split between what a unit owner answers for and what the association does, so establishing where a failure actually lives is not just diagnostic; it decides whose budget the repair comes out of.
The other force at work here is salt. Aventura sits barely seven feet above sea level between the Intracoastal and the ocean, and that air corrodes copper supply lines from the outside while the water inside works on them too, so pinholes turn up in lines that are not old at all.