@LilyBlueCat It's lovely that you brought up Shuninta Amano. Her works seem to be often overlooked by newcomers, even though I could easily say that most of them are classics at this point. What I always loved about her style is her relentless desire to tell layered stories that rely on a complex network of references. In "The Feelings We All Must Endure," for example, she does this amazing thing where the characters representing seven deadly sins evolve to become their own antipodes, which is basically in line with Jung's enantiodromia concept. What I mean to say is that you don't often get yuri as nuanced as that (I think the only other author who seriously invests in the intellectual level of their yuri manga is Sal Jiang, although her approach is different). And Shuninta Amano does this sort of thing even in something as silly as Ayame 14, even though it's a lewd coming-of-age comedy. 
I completely agree that, to many people, yuri equals fluff. That's why, for example, some people go as far as to say that CGDCT counts as yuri, too (a take I personally find absolutely ridiculous). Yuri is often defined as a genre about close (and not necessarily romantic) relationships between women, and technically, CGDCT falls into this category, but it is clear to me on a purely intuitive level that those are very different things. Something like a convergent evolution, maybe?
Personally, I love any form of yuri as long as it's a good story. It's not always the case, but it would be weird if all works in one genre were only good. What concerns me a little is that, with the abundance of gorgeous contemporary yuri like Amayo no Tsuki or the vice queens of toxic yuri (by them, I mean the triad of Destroy It All and Love Me in Hell, My Girlfriend's not Here Today, and The Face You Shouldn't Show), it may take years for a newcomer to finally get to read something a bit older, like Shuninta Amano, Takemiya Jin, or Ajiichi's classic doujins, such as Dear My Teacher. Hell, even Ohsawa Yayoi's earlier output is like that. It's not like anyone can do a thing about it, but it's still a pity, at least for me.