What's your point? So will writing your own custom UI toolkit, or manually doing your own font rendering, or implementing a custom equivalent to TensorFlow, or

What's your point? So will writing your own custom UI toolkit, or manually doing your own font rendering, or implementing a custom equivalent to TensorFlow, or writing your own implementation of the C standard library, or ... If you don't need low level control, you should be using middleware or a full blown engine (Godot, Unity, Unreal, etc).