That had nothing to do with plumbers.
They stink (and solutions to stop them stinking don’t work reliably), and they plug up plumbing with crystalized urine unless you also do things that don’t work reliably.
shrug
They stink (and solutions to stop them stinking don’t work reliably), and they plug up plumbing with crystalized urine unless you also do things that don’t work reliably.
shrug
My reference for the opposition to the urinals from plumbers came from this Wired article, iirc.
But they stink, and do have issues with crystallization of urine, and that's why I saw them ripped out after a year or two everywhere they got installed.
Like Buckminster, conspiracy theories are a lot more palatable reason for why your idea got shot down than it just didn't work well in real life.