You know if one can enchant his armor / weapon ? Because crafting a plain armor isn't good enough once you loot magical items.
This is not true. Weapon / Armor can be enchanted with applying elemental essences, Tenebrium Bar, Rubies, Grinding Stone or Tormented Soul, etc (more to discover). While magical and legendary weapons will cap at level 20, crafting weapons and armors can go beyond level 20, since they are based on your character level + Blacksmithing / Crafting skills.