Perhaps someone could share this information with the FCC, so they could begin fining non-compliant mfrs, and hopefully bring about some properly engineered power supplies, motor drives, and control systems.
I would love to see my employer fined into placing proper filtering networks on their power...
and about a million other industrial users who would like to pretend their trash doesn't go back out on the line.
Lamp dimmers should cost about 100 dollars for a non-filtered design, just like in industrial trade for pollution.
A properly engineered one that "sounds" like a passive rheostat ( makes NO RF noise) should be a proper $20.