I don’t disagree with that, but back then polygons are in the hundreds/low thousand, and now they have mega textures, huge models, which are simply too expensive to create. Not to say IDTech is alone in this, but I think not many companies can handle those things.

And the engine is way more complicated nowadays — UE at least has a huge community and docs.

I’m just an old man who prefers a much, much slower pace for the rendering engine. I wouldn’t mind that they grew so slow that we just got IDTech 4.