I will do an honest reply so you feel better about asking. I use it when it makes sense. I will not do it when I have things like engines, fuel containers, or something with what would have a bunch of electronics (like a command pod) because then you are cutting off some of the abilities of that craft due to lack of space. I will use it with things like landing legs and structure parts because then you are just manipulating the superstructure of the craft without effecting the volume of the consumables or something like that.