I've found that making a custom engine is more amenable to teamwork, not less. I can build a simpler level editor that I can give to a totally nontechnical per

I've found that making a custom engine is more amenable to teamwork, not less. I can build a simpler level editor that I can give to a totally nontechnical person (a.k.a. my spouse), and they can go to town making levels. They don't need to know anything about Unity/Unreal. They just need to know about my game. My game already includes levels my friends have designed using tools I made for them.