Why is Unity the most popular engine?

Didn’t know Epic was able to build game engines in such a short time frame.

Epic themselves said that they could not keep SVOGI as the renderer required too much work to be maintainable, which only means parts of the engine, if not all, are not built around the idea of replaceable modules.

You can get SVEGI (similar to SVOGI) in Unity, and SVOTI in CE 5. In CE 5 it’s just a checkbox to turn it on.
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I think you mean SEGI. Unity Asset Store - The Best Assets for Game Making

For the low price of $80 per seat…and it’s beta…and it runs like **** in any actual game scenario.

Unity 1.0 was release June 6, 2005. Same engine, different features bolted on. Take a look at how much old deprecated junk still remains in Unity after 11 years. Cysis 1 was released in November 2007. Why does it still look better than any game that has been produced professionally in Unity 3d?