Firstly, Uwell did break the coils, but says so, and only to demonstrate how the debris looks like IF you break it (page4). And breaking the material is rather easy as we learn - "pinching" is sufficient, which then releases powder (page2) - which btw I believe I have seen Daniel doing in one of his videos, but the coil was unusable after that, so that can't have been the source of his problems.
Secondly, in ADDITION to the problem above, they also describe what happens during the production process of the material (page5). A part of the powder that cannot be molded into the produced material and will instead stick to its surface, and falls off easily(page5).
Thirdly, the black spots in the material shouldn't be there. What kind of impurity it is, they don't know for certain, but given they know the production process, they might well have an idea what it could be, so if they assume it could be toxic, who am I to object?
VaporShark did an independent third party test. Like the majority of users, they didn't break, scrape or overheat the coil, but they did run the resultant vapor through a filter. They tested the filter and found no silica or glass particles, silica powder or mysterious black dots infesting the filter.
How nice.
The contractor tested 1 type of coil, didn't care how easily it might break during everyday use, didn't care what happens if it breaks, and all they did, was to look into a microscope with 40x magnification if they can see
any particulate matter
on the filter after pushing some vapor thru it. And that they didn't finy any - which is quite surprising, given that several studies (unrelated to ceramic coils) have claimed to have found exactly that. Then again, maybe that's not so surprising, given they probably looked at more than a single cellulose filter, whose filtering abilities concerning silica particles wasn't explained either in the report. Finally, no explanation was given for the filter's weight gain at the end of the experiment.
Uwell on the other hand looked at 3 differet coils, with up to 100x magnification, and concluded from their preliminary findings, that going forward with this wasn't worth the effort.
The Uwell testing is junk science looking to prove a pre-ordained outcome.
I don't have any mind-reading capabilities, so I can't comment on that. And yes, we have different concepts of what constitutes good science. I'll leave it at that.