I agree about the performance/efficiency and have a strong desire to make my own games run as fast as possible. That being said, one big advantage of engines fo

I agree about the performance/efficiency and have a strong desire to make my own games run as fast as possible. That being said, one big advantage of engines for me is cross platform deployment and testing. On my own I'd have to create various toolchains and fight issues during the build process. With an engine it's usually a couple setup steps once then click a button to build/deploy/test. I only have so much free time, I'd rather use it to add features or gameplay than fight to get things running across every platform I want to deploy on.