i strongly believe that it is impossible to build a tool that is both friendly to beginners and useful to professionals. the needs are on the opposite parts of a pretty wide spectrum. i feel like this is doubly so in the game engine space and the confusion between the two needs has turned every engine into a soup that is too much for a beginner and too inflexible for professional development
that is to say, i wish there were more beginner oriented engines that focused only on getting things up on the screen quickly and didn't bother so much with optimization, deployment and extensibility (Processing is a great example of this) and professional engines were closer to what they used to be: just collections of low level libraries that made the job of rolling your own tech accessible to people who already know how to code (this is my current personal goal)
