I agree with you on many of your points. I think the biggest issue is that the amount of pollutants in the air caused by use of a SM cannot be known by a regular consumer. I would rather be safe than sorry. Yes, smoke from burning wood carries pollutants, but you wouldn’t light a campfire indoors and a properly working chimney will cause the smoke to be pulled outside.
For those of you interested, I have posted an open letter to SM regarding the Air Purifier: Open Letter to Snapmaker re: Air Purifier