Magic armor does protect you from stun, but chances are, unless you're specifically going after gear for Magic Armor, with everything else being secondary, you're probably not going to have too much of it before you get to that fight, and it comes off pretty easy.
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Very Minor Spoiler Warning#
We have only played the first act, you will almost certainly have more access to magic armor as time goes on. Calling for radical changes the system really isn't needed, at most they should change the rate at which magic armor appears but honestly I don't even think that is necessary. I've been through the current content a number of times now and even on my first full playthrough I had no problem dealing any of the content that wasn't telegraphed heavily. (ex: fight in the castle, frogs, skeleton ambushes, maze, final fight)
I didn't even take any particular precaution except that all my magic armor gear went on the tank who was always at the front of the party, and I actively attempted not to stand in water after experiencing the mass shocking during an earlier fight with people in the camp. With these two simple steps that pretty much anyone could infer with one encounter it is incredibly easy to make it through the first chapter with only minimal magic armor. Maybe I'm crazy, but those are pretty easy to identify optimizations.
