@optic yellow - Per what
@badmice2 highlighted, it's not really tech "advancements" so much as it is
differences. Many of us prefer the more dense, meatier, chunkier layups of the 90's, 2000's and early 2010's over a lot of what's being pumped out today -- often lighter, airier, crispier, and laced with dampening "tech" to try and counteract the loss of recoil weight and higher amount of vibration and shock propagation. On the flip side, the redesign of certain beam shapes and inclusion of new graphite co-composites has brought a certain degree of desirable enhancement, so the overall "progress" is a mix of better and worse, IMHO.
Besides needless change for the sake of simply selling more tennis racquets, a large portion of frame evolution has centered around optimizing for poly and poly-like strings, as well as attempting to provide easier access to higher racquet speed, spin and power, all of which have become paramount at really any level above beginner. While most of those changes may seem like no-brainer "progress" to most, there's still a fairly large contingent that prefers their weighty (both static and swing weight), dense and/or thin-beamed frames, which are often more meaty/thuddy in feel, and prefer them for a myriad of reasons, often just because they simply feel better on contact and are more of a joy to play with, win or lose. Obviously, most of those qualities tend to align less and less with where certain trends are moving in racquet design -- namely dumping weight and adding dampening. So from that more old-school type perspective, one might even say there's been some
de-evolution going on. Older-school racquets can still get the job done, quite enjoyably (even preferentially) for certain players, even if those types of players and play styles are dwindling.
So in summary, I would say the newer racquets aren't always an obvious step forward, but rather they're more of "usually" at this point -- a bit less cut-and-dry as golf drivers, where, as you said, the change in tech is a bit more of an obvious march forward, about which most golfers can universally agree. With tennis, it's a bit different, at least at this point. Just my 2C.