None of these questions are important to me. But I'll ask again. If I reskinned a goblin into an automaton how have I treated you unfairly? How would you even know what I did?
I've got a lot of experience DMing and I've been reskinning for at least half of that. Based on my personal experience it pretty much plays out how I expected, Well, you know, save for the randomness of die rolls and whatever crazy crap my players decide to pull.
Goblins and automation are so far apart from them wise why even call them automation if they aren't going to act like automation? It's going to feel unfair like the players have lost their ability to direct how things play out. Like a player will see of we are fighting a clockwork automation and they will be like let's use the anti clockwork spell, but it won't work because they are actually fighting a goblin.