I can't talk to as far back as GP, but as someone who's been teetering on the edge of whisky snobbery for the past decade or so: a major change has been a shift

I can't talk to as far back as GP, but as someone who's been teetering on the edge of whisky snobbery for the past decade or so: a major change has been a shift to no age statement (NAS). This has been accompanied by an obliteration (either complete unavailability, or equivalent due to costs exceeding sane economic bounds) of older options. The logistics for a product that has a 20+ year lead time are extremely fragile against varying market demands. This isn't inherently bad. There are some mind blowingly good options (Octomore et al) that fall under the NAS umbrella, just a different set of products to what may have traditionally been seen as a defining production technique.