I vote for this blueprint feature. I have maxed out my Lancer (to get rid of enemy Lancers) and still receive blueprints whenever I open chests and I also get offers on the shop for buying Lancer blueprints with credits. It will be much nice if they allow us to "trade" blueprints of lower rarity into blueprints of higher rarity. 

The trading is done through a "Blueprint Shop" where blueprints for random gear will be available and you can trade any mech/weapon blueprint of the same rarity to buy a specific blueprint available for the trade

1 Legendary blueprint = 3 Epic blueprints

1 Epic blueprint = 5 Rare blueprints

1 Rare blueprint = 7 Uncommon blueprints

1 Uncommon blueprint = 10 Common blueprints

I think this feature would be adopted by the Devs, hope they'll add this feature soon

Make blueprints universal for their grade too instead of having them individualized for mechs and weapons