Dark mode by default
Having light mode as the default theme can be quite bright and loud upon first entering the site. Dark mode is much easier on the eyes, and much easier to read.
I like this idea, but I can understand why this isn't a good idea. Someone that is blind, or partially blind, could have trouble seeing the lettering on the dark screen, and would need the contrast of lettering on the white background, in order to make out the words.
Perhaps, when you sign up for the platform, after you pick your username, the next thing you pick is "would you like to be in light mode or dark mode (can be changed later in Settings)"? And they leave in that mode across every page you access, be it a Twitch stream or the main page.
Because, frankly, going from seeing a twitch stream that's in dark mode... to being on the main page, and having the bright-white background searing my corneas... is a little painful. And the fact that Twitch hasn't gotten that much figured out is a rather glaring oversight.