I mostly play for the engineering side of it, so in all my bases over the years, I always always play on "peaceful" mode. It makes part of the tech tree useless

I mostly play for the engineering side of it, so in all my bases over the years, I always always play on "peaceful" mode. It makes part of the tech tree useless (no need for better guns if there's nothing to shoot) but I find I enjoy the game much more that way.