They look bad, don't know how else to put it.

I don't support Optifine and therefore Shaders using Optifine.

What about shaders that don't use optifine such as using Oculus instead, since that's actually open source? Haven't encountered issues but want to know if it's ok to report if any come up.

Shaders in general are hard to support to begin with. If one of my renders breaks assumptions made by others then there's really nothing I can do but stop making fancy renders altogether and I don't want to do that.