also a stamp creator might be handy if you want to make something very detailed to add an UNLIMITED amount of creativity.

That's true, and I'm as unhappy about it as you are, but it does mean that even the most complicated objects the game shouold work on less powerful computers. It also forces us to be more creative in how we build and script objects. I can't make Batman create a custom batarang object, but I can make him throw black moustaches! :P

but it just feels better to have a weapon or character that you made, that shoots or throws an object that perfectly fits the weapon or character. for example you want to make a turd cannon, make the turd cannon look like, let's say, a monkey being held backwards with it's butt sticking out. but, when you want to make the turds to be launched/pooped XD, you can't and you will have to make due with another brown object that doesn't remotely look anywhere near a turd

it just feels better when you have a gun/character that throws/shoots an object that perfectly fits the gun/character. imagine you make a turd launcher that looks like a monkey being held backwards. then, you want to make the turd, but you can't make your gun shoot object editor objects, so you will have to make due with a brown object that doesn't look remotely like a turd