[jijijijij]

> Any form that doesn't have loose fibrils, microparticles, or dust.

Encasement breaks, materials erode, have to be manufactured and disposed. That's not a valid argument at all.

> I'd compare it to wood from walnut trees

Well, then you are very uninformed. The toxicity characteristics are nothing alike. If you want to point to a similar hazard, I'd suggest beryllium compounds.