This has been an interesting read on many levels. I think a few things need to be addressed though.
The "lack" of briar is not due to any Asian carvers / countries buying up massive quantities of premium briar. One of the "major" suppliers in Italy was approached with an offer to buy all his briar. He rejected the offer. No one with a long term business goal puts all their eggs ( or briar ) in one basket. So forget blaming a single buyer.
The main reason was the pandemic. Many areas that briar is harvested were under very strict lock down rules. Thus even IF there was briar to harvest, it was not permitted to harvest. Now in those regions, like here, trying to find people that are willing to work is challenging. Thus getting briar from the ground, is not as it once was.
This is also why many of the Italian brands have not been offering as many pipes as pre 2019. Due to lockdowns, the workshops and factories were closed. All that I have spoken with have told me they are slowly getting caught up, but it is a slow process.
On to grain ...... interestingly I was at Castello in Cantu a few weeks ago. The number of rusticated pipes and sandblast pipes were far less than smooth pipes, be it mixed smooth, cross grain smooth, flame grain smooth or fiammata graded smooth pipes.
At the Radice workshop in Cucciago the number of rusticated pipes were far greater than smooth or sandblasted pipes.
The artisans, workshops, and factories are at the mercy of the briar they have in inventory. Sometimes it's great and sometimes it not. Sometimes it's somewhere in the middle. While at Castello I viewed a large bin, large enough to hold three intimate friends, that was filled with partially finished pipes that were all discards. Each had some flaw, whether in the chamber or on the exterior, that rendered each piece unfinishable.
FWIW, these discards are not used as heating fuel, at Castello. Franco told me that these are saved and used to experiment with different stains and potential different finishing techniques. Things like the Le Dune finish came from experimenting with carving techniques. Also these may be used to workout new shape variations. Carvers are not stupid. Even the discards have a purpose.
Anyway, just a few thoughts .... and maybe one more .... many many years ago, when I began my business, a wise mentor once said to me .... Mike ... in this business if you haven't heard a new rumor by 8 am ..just wait till 9 am .....
Mike