u/robo-thing

We know Mega Man can copy weapons from Robot Masters, which makes sense since he and the Robot Masters are of a similar technology. But he can also copy the weapons of the Stardroids, which is a little odd considering they're supposed to be alien robots (unless they somehow coincidentally have similar technology to Earth robots). At what point would Mega Man not be able to copy someone's weapon? For example, would he be able to copy a Reploid's weapon? Can I get Mega Man to slow roast a turkey for me?