My apologies. I did in fact do an extensive search beforehand to see if anyone else reported this glitch but MC-98796 never came up. I'll look harder next time. Thank you!
Nah. You take just as much damage when falling with armor as you do without. Seems pretty realistic to me.
It is because you are in creative. In creative mode it is purposefully made so you can enchant any item with any enchantment. In survival this would not be possible.
Glitch still exists in minecraft 1.10.