Very interesting article. A few nitpicks however:

I’m sure there were other true-3D games before it, but I challenge you to name one off the top of your head

Descent was published in 1995, one year before Quake. And it was fully 3D, even moreso than Quake since you could rotate around all three axes.

Before Quake, games couldn’t even simulate a two-story building, which ruled out most realistic architecture.

The Build engine (used e.g. in Duke Nukem 3D) was capable of faking multi-story buildings with the creative use of teleporters.