When it does leak, it forms an aerosol that travels low to the ground and that is pretty deadly.
Ammonia seems like a grid scale storage solution, not something we can distribute across people’s homes. Home storage we should start focused on thermal batteries since it’s highly proven technology that needs almost zero maintenance.
Besides, differently from what the GP claims, it does need to be pressurized. It can indeed be used as a fertilizer, requiring careful application because if it's over-applied it's pretty deadly to any plant, and if applied incorrectly it can leak from the soil and become pretty deadly to anything above it.
But some people really do love the stuff and believe it's a solution to everything.
Sure, we have the experience and infrastructure to handle it - just not at the scale required to use it as fuel.
Just don't, say, descend an elevator shaft into an un-ventilated sub-basement with ammonia storage.
The amount of inconsequentially small ammonia leaks which nevertheless the owner insists on a service technician fixing immediately because of the alarming odor, actually form most of the case against ammonia as a refrigerant, which it's otherwise well-suited to.