Full disclosure, I'm quite new to mixing and mastering, so apologies if there's an obvious answer.
I've noticing this for at least five years, but never gave it much thought. Lately, I started listening to Spiritbox, and hearing it consistently song after song made hearing it unavoidable. I will say, Courtney LaPlante is a PHENOMENAL vocalist, and I'm amazed at what she can do with her voice. Her vocals sound great. They're clear, articulate, and smooth from a mixing perspective.
But the rest...my God. It just sounds like ass to me. At first, I thought maybe it was just something about the guitar tone, but the longer I listened, I realized it's something with the actual mix. It sounds harsh, and not in a good way. It's got this quasi-industrial nails on a chalkboard quality, and I can't figure out what a producer would have done to make it sound that way.
Suddenly Poppy came on the algorithm, and the effect was nearly identical. Clear vocals, pumping, harsh everything else.
It's obviously not every band, but I've heard numerous examples that have the same quality on radio.
What's going on to make "that sound?" Why would anyone go for that sound?