At the risk of admitting I'm even more of a dinosaur than anyone else, Mark, I am using Lightroom 6.14 - which was the last standalone LR that could be purchased I believe. I'm not sure if it is the same thing as "Lightroom Classic" but for some (probably irrational) reason, I always thought that LR6 predated LR Classic. In any case, I actually have NEVER used (or even tried) its 'face recognition' capability - so I honestly don't have a clue. I do remember reading that LR6 didn't do the face recognition very well and that numerous users reported it actually made the program freeze or crash. Incidentally, I run mine on old Mac Hardware (a late 2012 Mac Mini) and relatively old Mac software (OSX 15, aka Catalina).
For what it's worth, my ancient LR6 has always pretty much done almost everything I wanted it to and more. I do use a handful of plugins (including the original Nik series), and on occasion (usually with wildlife or bird telephoto shots), I also use a slightly archaic version of Topaz Photo AI (the newer and more contemporary versions won't run on my ancient hardware).
I've always held that the two primary principles of any technical hobby are "please yourself" and "whatever works".
There's a piece of software my WinTel box I use for managing content on my Nokia 3330 (original version). The program's over 20 years old but works just fine. In using the word 'dinosaur' disparagingly it's often forgotten, or overlooked, that dinosaurs existed for about 165 million years whereas us 'new' Homo sapiens have been around for only 300,000 years.
A Mac Mini M1 sits on my desk for editing but a much older (and much slower) Mac Mini sits under our TV for playing home movies we've shot on various devices over the years. Both work perfectly for their intended purpose.
I too had the older, standalone versions of LR but my later cameras weren't supported. I also wanted the newer features as I'm one of those people who wants the latest software in case I'm missing out on something. Can't help it, it's just the way I'm built.
I think 'Classic' was added to the name of the locally installed version to differentiate it from the online offering which was called, confusingly, Lightroom. Cynics might argue it was an attempt to migrate users to the online version and sell cloud storage with it.
LR's face recognition can be very hit and miss. It recently identified the pattern of a beige, shag pile carpet as the face of a very close friend. There are 100's of photos of him in LR, all 'face recognised'.
Perhaps Adobe see face recognition as a 'must have' to appear to keep up with the competition but consider it of no use to the 'serious' photographer. As LR's the best all round software for my purposes, I'm content to work around its 'foibles'.