In my brief time trying out Unity (as a non-game-developer) I found the programming paradigm very frustrating. I wanted a more object oriented approach. But what I found was to get things to work in a performant way, you'd end up with very leaky abstractions. At the core, my thinking is it has to do with everyting coming down to handling on a per "tick" basis rather than as an event. Maybe I just did things wrong... but this seemed to be the direction you're guided in. If you do try and build a good quaility event model, the performance was terrible.