I think covering the "mainstream" is the point of the site. Don't get me wrong, I really do enjoy fast loading text based websites, but if web devs had to worry

I think covering the "mainstream" is the point of the site. Don't get me wrong, I really do enjoy fast loading text based websites, but if web devs had to worry about those browsers, then CSS (and web technology in general) could never develop past its infancy. Whether that's a good thing or bad thing is up to you.