Toxicology is a moving target, and a sensitive one at that.
So there is no once and for all answer to what's bad and what's good. At the same time, I detect a note of hysteria in general discussions. It is well to remember that ceramics, pottery and glazes are old, very old, in the experience of humankind, and we haven't been killed off by it yet. When we discuss risks and toxins, we tend to do so with emphasis on the dire consequences, without regard for the fact that most of what we are discussing has been in common use for a long time. There is an experiment which has been proceeding all the while, called life, and the general outcome is not wholly bad.