I did not write the code and IMHO the hum bar is just a kind of a nice gimmick. It is a phenomenon that happens, by filming a CRT screen and the camera is not in sync with the CRT screen. It is not something that really happens on a CRT screen, not even on a one with quirks.
On the other side, it feels bad seeing Jezze´s work/functions removed one by one, like it happens already and just for the purpose of BGFX. I am neither a Linux or a Apple user, but that is just my opinion.
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Re: CRT-aperture GLSL shader
