Asbestos comes in the form of macro-particles that you could eat a pint full of and probably not metabolize any. Doesn't make it good for you. Neither is lead or mercury (even if they aren't the same "large chunks" we're talking about). But all 3 were once considered mundane and safe. Just like the tar in cigarettes which contains long chain hydrocarbons remarkably similar to many of the synthetic polymers in wide spread use today.I am highly skeptical of this entire micro plastic business. How will plastic fragments pass the molecular boundary in digestive systems? Bodies absorb molecules, atoms bound together, not large chunks(compared to molecules) of plastic during digestion.
Ditto once in the blood system, how would the plastic get out of the blood without being molecule size?
I'm by no means an alarmist, but I strongly suspect that in 50-100 years our kids and grandkids will be laughing at how much plastic we consumed just like we laugh at asbestos filtered cigarettes now.