Can I respectfully offer my opinion.
I think the guitar is a rather unfashionable instrument at the moment, although lockdown might have given it a boost with the apparent rise in people learning to play the guitar over rescent months. Lack of rehersal spaces, the rise in computer tech and solo artists having control over their work seems to be the order of the day.
The lack of vision by record companies. I mentioned on another thread, could you imagine record companies allowing The Beatles to not tour at the peak of their powers. Zep would have far more battles regarding their musical adventures with their label and Bowie probably would have left the industry to do something else.
Someone once mentioned here that Rock has also splintered into many sub genre's; so that has not helped either.
I find Prescence and ITTOD really interesting but difficult LP's to enjoy per se.
Maybe that record store just overstocked or we have the younger generation only wanting the classic Lp's IV or PG for example for LZ ro SPLHCB or AR rather than the more foundational or abstract works (I find the White LP hard work).
Simply put I am just pleased that ITTOD and Pesence and The Whit LP got recorded at all as they would not get the chance now.
By the way the movie industry has the same issues. Apocalypse Now, Bladerunner and a few others would have had the productions shut down becuase it is all about the bottom line now.