I really miss the ability to instantly create something after grinding for the materials. I remember when I was going to build a reactor core, I created buildings/temples to house the reactor. There would just be a building I would visit as I slowly gathered the materials and built the core inside. When it was finally completed I set it off and the building was now just gone and replaced in an instant. Also my friends and I would set these off at each other's bases, and there would just forever be the core to mark where the base once stood or sticking out of the ruins.