And watch games prices/microtransactions skyrocket as every studio making a 3D multiplatform game needs a huge team of in house developers to develop their engine...
Engines have gotten way more complicated since the 2000's. There's a reason only a few AAA studios have their own robust in-house engine nowadays
I think it's hard to make an engine that lives up to today's gamers standards. I mean, engine building is hard either way.
There is always Open 3D, but having some association with AWS probably sullies it's name.
Farming Simulator 22 was the game that ran the worst on my PC. Performance was even worse on lower settings and the graphics weren't any good. I had a Ryzen 7 5800X and RTX 3080. Luckily I just played it using Xbox Game Pass and didn't buy it.
Eh, they're not always a good solution. CDProjekt ditched their own, which led to a lot of bugs in Cyberpunk 2077, to move towards Unreal. Bethesda's notorious for their very buggy mess of an engine. And people working under EA complained to hell and back about having to use the Frostbite engine for everything.