I'll just note that the EAA is not the only accessibility law operating in the world.
Furthermore there might be accessibility use cases in which your site works better for some people in dark mode and better for other people in light mode, expecting that people will switch their device settings when they come on your site if you have this problem would not be nice.
Furthermore there might be accessibility use cases in which your site works better for some people in dark mode and better for other people in light mode, expecting that people will switch their device settings when they come on your site if you have this problem would not be nice.