I totally agree with the point of this post, too much "boomerburst" everywhere, BUT just to be clear, that's not a bad thing at all, even I really dig some of those looks.
But there is some truth on what the OP is saying. Even tho we have a "modern-looking" electric instruments market, I feel like it still is somehow a niche and minority thing, specially if we compare it to the big 60's reissue/inspired market (like most Fender and Gibson available instruments) and even the 80's "superstrat-ish" thing. That could be partly because there still is a big demand for those kind of instruments, because of boomers and because younger people that really like more classic stuff use to behave more or less like boomers (even in terms or music taste, instrument look whatever), That AGAIN, it's not a bad thing. But is it true that a big market, let's say, that overall is "centered" on a specific era, when people of that era will be gone, it will turn more and more "niche", unless it embraces younger people tastes, the ones that are more capables to adapt are the ones that have more chances to survive.
There has been several technical improvements on guitar design that are still a rare thing to see around because of what the main demand still is, or even has taken decades for people to see it as a desirable part of the instrument for a variety of reasons, even I really think that it has something to do as well on how most modern music has been having less and less guitar over the years, because it isn't as "cool" anymore as for example, on the 80's. And also it has a lot to do of the cultural distance between younger people and older people (you know, for example, older people ranting about whatever young people do and listen, specially without having listened activelly to some of that new music to form a proper opinion on it, it works on the opposite direction too).
Of course I'm talking in general, obviating a lot of nuances, of a way more complex thing, simplifying what I think is a very interesting topic and is has been discused over the surface and on a "clickbait fashion" over the years, like: "oh no! Rock is dying!", could be epic to discuss it from a multidisciplinary perspective, you know how cultural, sociologic and generational behaviour affects markets and how it affects back.
I have the horrible mania of trying to analize stuff all the damm time. Anyway here's my chunky fretless, it was an all-black Fernandes Gravity bass (it was my first bass). I refinished, defretted it and changed all the hardware into golden stuff just to have it in a more funny and "rustic" fashion, not too modern-looking and not the best job, but definitelly a bit cooler than before!