Leather armor DID exist. Just not in the supple "jacket and leather pants" type we see in fantasy games. instead it was boiled and formed, sometimes molded (as in cuir bouilli armor.)
And plate armor's old, going at least back to the myceneans; what is a (contextually speaking) new style are the fully-articulated whole-body suits of armor.
As for the hybrids, gotta remember that "hybrid" is just a handy term for classes with melee and spellcasting powers, not strictly speaking that they are combinations of two distinct classes. Each is its own entity, and is not limited by the abilities of non-hybrid classes with similar kits. Paladins don't wear plate because Warriors and Clerics wear plate - Paladins wear plate because Paladins wear plate.
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