Because OpenGL is not supported and thus not developed on a regular basis. Cinefast is currently working on bringing OpenGL lighting back, so you might see it in a future version of SRB2.
It always create SRB2 version 2.07, I heard say that a version called 2.11 arian something.
It always create SRB2 version 2.07, I heard say that a version called 2.11 arian something.