For me, I want something like game maker studio, but with 3d and 2d game support, no drag and drop but code but with a lot of premade functions for common game problems and genres, automated memory management, being able to use zips as resource packs (mount, read, write etc), but no unnecessary components like sprite editors or draw programs (there are better 3rd party apps, I'd rather have the ide focus on easier coding for beginners). Lots of tutorials and templates. Keeping the core of something like GMS, sprites, objects, textures/backgrounds/graphics, sounds/music, rooms with layers, model and animation support (fbx, obj). It has to look nice and be performant. It doesn't have to be an unreal or unity killer. Maybe use a suite of preexisting apps--tiled for various components but optimized to work together