I guess I'm assuming that when a publication chooses something to publish, it's because there's something unusual about it that caught its eye, and that things that may be "good" but are not "unusual" enough are just shoved off. So I'm guessing while the voice is not a "problem" that it's a voice that has been seen before too much for them to want anything like it.
Yes to the first part, but no to the second. The uniqueness has to be in the story, which is -- hopefully -- a seamless blend of narrative, theme, voice, characterization, etc. The story needs to stand out as a whole, but if done right, even the most unusual -- or the most common -- voice will vanish into the larger telling of the story.
Like last I read a volume of Shimmer, there was maybe one short story that was kind-of-sort-of-not-really-but-maybe like anything I'd written. Most of them were "spidersilk" (not that that's a derisivie term, it's just something I can't do.).
So, there are definitely a few markets that tend to like more ornate language than others (and state as much in their sub guidelines) but again, that's frequently a reflection on the story being told itself, and those tend to be fairly specialized markets in terms of genre, and isn't quite the same thing as voice. Most of the broader SFF markets don't have that emphasis. So it's just a matter of writing the best story you can, getting the best feedback you can, and then sending it out to any fitting market while you work on the next thing. There's also no reason you can't experiment with voice, whether or not you think you can do it -- writing isn't a monolithic and unchanging skillset, but a progression of many small skills as they are exercised. I know I've written stories just to play with aspects of craft, and while they aren't always (or often) successful as cohesive stories, the learning that comes from then find ways to manifest in future work.
I have a hard time describing what I write and I can't post on SYW for this reason in particular. Dani has read what I wrote, what I sent her was very typical of what I send out. Though I don't want to put her on-the-spot.
Yes, we shouldn't put Dani in the spot. But next time you send something out to betas, specifically ask them about voice, and whether it works with the story you're telling. Hopefully that feedback will provide some reassurance, or if not, give a better sense of what you need to pay more attention to as you write.