Thanks for the replies, but those are not really styles. Those are character formatting options.
When I say "style," I'm talking about heading styles, paragraph styles, etc. The only thing in that menu that qualifies as a style is the code block (which is a welcome addition; don't get me wrong).
If the headers are available in the beta client, perhaps I'll switch to that channel. I've been using Evernote for over 10 years, and have wanted this for that long. I recently tried to switch to OneNote, but although it has many more text options, it really is more focused on taking actual notes, not a repository of information, which is what Evernote is. The Evernote organization options blow everything else away, too. Finally, for some reason, the OneNote web clipper now seems to take a screenshot of webpages you clip, which is precisely the last thing I ever want ever in my life ever. I want the text; why would I want a picture of text?
I'll check out the beta client. After trying to use OneNote for a bit (as well as various iOS things like Notability), it's clear I'm an Evernote guy and that's that.