Interesting article. My limited experience has been that the intentionally coated bowls ( like the dark coat on a Peterson ) didn't offset the taste, but those bowls with an interior stain ( Falcon ) tasted terrible. I recently acquired two new Rattray pipes with naked briar. Although I've only smoked one I didn't notice any ill taste and have found it is building a cake nicely. The falcon bowls however have the stain inside and do taste horrible for quite a few smokes - but of course with some breaking in taste fine. It would be interesting to know which pipe makers coatings infer a flavour- negative, tasty, or neutral to the first few smokes.