On the contrary, custom engines have been bombing.

Look at Starfield or Cyberpunk 2077 or basically any custom engine AAA.

…Then look at KCD2. It looks freaking fantastic, looks like raytacing with no raytracing, runs like butter, and it’s Crytek.

Look at something like Satisfactory, rendering tons of stuff on a shoestring budged and still looking fantastic thanks to Unreal Lumen.

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There’s a reason the next Cyberpunk is going to be Unreal, and its because building a custom engine just for your game is too big an undertaking. Best to put that same budget in optimizing a ‘communal’ engine.

Borderlands 4 is slow because the botched optimization, not because its Unreal.