As someone who works making glass, I want to underline that it’s silica dust that is dangerous. Your windows, drinking glasses, pyrex jugs, dinner plates, they’ll all be around 40–50% silica and are absolutely safe. Silicosis is a reaction to the shape of silica particles when inhaled, the particles cause scarring in the lungs and aren’t “mucused out”, so they remain causing more damage over time.
I can’t think of any reason to ban anything for containing silica, the problem is mitigated by wearing a mask in areas where there are airborne particles.
Ah, I missed what you were getting at before. Agreed, can’t see why engineered stone should be a particular hazard if proper safety measures are being taken. Best guess is that they weren’t, and this ban is simply the chosen way to stop people being harmed by the work. Just seems more performative than useful.