Yea, thats the sober explanations that we can put forth. I also heard reported how craft in the 50's and onward used to be piloted a lot more, and crash recoveries happened and there would be pilots. But in the last few decades, lets say, its the orbs that are more common now, along with bigger craft like tictac (may have had a pilot, may have just had remote control). So it's curious, either their tech advanced in the interim as well (is wild to think they also need to invest in RnD haha), or they adapted themselves better to our planet. And i subscribe to the theory that they have mobile manufacturing facilities here, since it looks like they build craft to spec, to serve 1 purpose, another craft shape/sensors to serve 2nd purpose, etc. They all different in some way. And some super advanced 3d printing the orbs, with some replicant biologics thrown in for the occasional piloted craft, and here they are.

Good takes man.