It's definitely got a strongly tinted background now; in combination with the green it does make it pretty colour-heavy, which may be hard on some people. I tested it out and did find myself wanting to change it back in a hurry (sensory processing issues).

As a practical point, it means that Lynx is the only available site scheme with a white background, right?

Neurologically-based visual processing issues can be very idiosyncratic, so there's never going to be a one-size-fits-all option (I know some people have an easier time reading with a tinted background).

But maybe it might be worth thinking in terms of choices -- making sure that there are at least a couple of site schemes with a white background, for example.