What i want to point out is more obvious in the anime... but isn't the existence of automails a little bit out of place?
Well i don't say that they are not cool or that their existence doesn't help the anime to progress nicely... but just how can they have such advanced technology when they don't even have planes ... it is not only the mechanical part but the biological too . Even in real world we don't have enough knowledge to make something like this to actually work , let alone it being common knowledge that can be applied but winry..
Also in the anime adaptation the difference between the 2 worlds is the development of alchemy and technology .. and yet the technology of an automail is just lightyears ahead of zeppelins and V2 rockets.....
So.. what do you think? ( having said all the above, i feel i need to make clear that i am not annoyed but it .. i like the way they limit or enhance ed's capabilities )