Some "engine" vs "gameplay" abstraction is needed though. It's not about re-use, it's about a strategic separation of concerns allowing you to iterate more quic

Some "engine" vs "gameplay" abstraction is needed though. It's not about re-use, it's about a strategic separation of concerns allowing you to iterate more quickly over your gameplay. You don't want to deal with linear algebra or image format loaders when you're modifying the way your enemy monsters behave.