That's a really interesting question, and impossible to prove. My oldest pipes provide the best smokes.
As the post says, the briar has had two or three decades to age beyond what it did at the pipe maker.
Older pipes have been kept and maintained because they are good smokers, whereas many of the less
good ones have been discarded. In the heyday of pipe smoking, in the 1940's, 50's, and 60's, there was
more profit in pipe manufacture, and more competition, hence a lot of pressure for quality. However, as
a debating point, I think a case could be made for pipes being made today being generally better. It's a
more limited consumer base, but more discerning. Just consider the brilliant and highly expert members
of Forums! Definitely individual makers veer from best quality from time to time. Though this rap has been
put on recent Petersons and some Lucianos, for example, my Petersons and Lucianos are all great smokers.
Out of about sixty pipes I've owned, I've unloaded only about twenty, only one for actual damage, a cracked
shank/bowl juncture, a pipe from the 1980s. I've unloaded the others for less good smoking characteristics,
and all of these were bought in the last five years.