>>2
Because it's a pain in the butt to browse a board that uses sage "correctly" using a web browser.
I was considering modifying chaika[1] a couple months ago, but that's not going to happen, Shitchan lacks too many standard features, and it doesn't even put old threads in an archive so shit would probably be really slow and bandwidth-raping.
[1]
http://chaika.xrea.jp/index.php/screen-shots/