I think the problem is that in the post 1997 section everything is mixed up together: last year's boring Cube with a 1999 Rocky Mountain that deserves better. Add to that some people that are not able to see beyond their own preference and prejudice. If you like
riding bicycles, I said actually riding them!, you shall know by know that today's quality bicycle kicks the one from our beloved "classic" era, whatever that's supposed to mean, directly in the nads. You know what will hurt purists even more? That this year's cheapo RST or Suntour is superior to any Manitou or RockShox from before 1997, that those ugly Tektro V-brakes are about 10 times better than ANY of that billet cantilever junk, that you can actually get decent tires that grip and are NOT amberwall and that ugly but wide 31.8 interface handlebars plus short stems are a blessing in terms of handling.
Oh, in case you have missed it, today's do-it-all and go anywhere mountainbike is a lightish air-sprung 150 mm full-suspension with aggressive geometry that is decent to climb and FUN (hey, remember this word?) to descend, hydraulic disc brakes, remote control dropper seatpost and grippy tires of high volume. Because back in the 90's, that period that we all hold in such high regard, the mountainbike was a versatile piece of machinery that could take you places and teach you experiences. Now we have a heapload of specialized (sic) bikes that are all crippled and limited in their specific domains, but there still are contenders for the title of do-it-all and fun mountainbike. By the way, the evolution of the Stumpjumper, as a model, is no coincidence to what I'm saying (even though a tad different) and Specialized aren't stupid.
As for the "vulgar" 1998 plus section, as some vain members look at it I notice, you will have some nice surprises over there, if you manage to conquer your very own prejudice. Some awesome Lobo restorations in progress, the odd Intense and one that is at least as good as pretty much any build on this forum: the Yamaha themed Rotec bike.
As for bikes and how a certain era makes them "superior", please tell me how my 2003 Tazer, my 2004 M1 or my 1999 Chameleon are sub-par compared to some silly HiTen bodied Kona Hahanna from 1996 or a Mongoose, or a Raleigh or any below mid range bike of a "beloved" brand!
Don't take this post as an offense, please. It is not meant as such. I just guess that sometimes people seem to forget that retro bikes are just a hobby, not a religion, that functionality has very little to do with passion and that we are actually moving forward in terms of bike design and development. If you doubt me, just try to ride on a mountain trail of some difficulty an impeccable mid early nineties Yeti or a "period correct" Klein with all the extras you wish versus, say, this year's base model Trek Remedy. In the end, the sport is called MOUNTAIN biking and having fun while riding is a benefit, not a fad.
Happy trails!
Mx