It makes me appreciate the color and textures of older engines.
Jusant doesn't look the same as Robocop Rogue City doesn't look the same as Expedition 33
The game I have the most hours in, Don't Starve Together, is made in a custom engine, it's not Unity or UE. No Man's Sky is also a custom engine. Deltarune is made in freaking game maker.
UE5 games are eye cancer to me. I honestly couldn't play R.E.P.O. without feeling nauseous.
Whenever you use a pre built engine for your game you're putting a limiter on yourself.