Wait that's not true, Isn't Stealth Field in the game just for that reason? To boost your evasion to such ridiculous levels where you're pretty much untouchable?
Or do you mean that you wouldn't be able to defend from certain boss only event attacks? If so a quick note in its info box could clear that up like saying: "Hey, In a realistic sense, You can't block missiles with your arms." (Please get back to me on that, Not really sure what you meant by that n_n
Wait, Then why is "Waiting" in the game?
Given waiting is like skipping your turn, I Really don't see the harm in giving that option a
purpose for being there like for reducing damage. That ability would be pretty invaluable really!
(Seriously though, Why is 'Wait' an option? fantasizing and teasing fill any role it might have had twice over. Even the Description of what it does questions its own existence)
Given the right wording, it could even progress the battle in an RP sense with unique blocking quotes.
Take this for example:
Your fighting a Male Zil!
You Decide to defend yourself from any oncoming attacks!
The Zil's attacks easily graze off of you as you were ready to take
the brunt of any Assult, Physical of otherwise that was to
come your way. (S: -2)
Your fighting a Membrane!
You Decide to defend yourself from any oncoming attacks!
You take long and deep breaths in an attempt to calm your mind and
spirit as you try your damnedest to resist the Sentient
Rag's assault on your mind and desires! (L: -5)
Your fighting Dane!
You Decided to defend yourself from any oncoming attacks!
You put your arms up in an attempt to fend off the flurry of blows
coming from the Four-Armed Ausar!
(Reflexes Low)
Not able to keep up, You take the full brunt of most of the punches
while only able to lessen the impact of a few. (S: -15)
(Reflexes High)
Able to anticipate the punches almost as quickly as Dane was able
to make them, You Swiftly block and soften each one of the blows!
Nevertheless still able to tell just how powerful this man was from the
sheer force behind each knuckle the came flying at you! (S: -6)
Dood, It can totally work; You just gotta be creative with the wording =)