If [INSERT SKILL, STAT, LEVEL, PERK, TRAIT] in needed to get blueprints or just to raise the chance to get one, then it's just another make-o-alt-for-feature.
I don't mind that the schematics would pop up once in a bazillion encounters/lockers/caves/shops/quest rewards just as long as everyone has a chance to fine one, not just a 300% lockpick, 10 luck, treasure hunter standing all day in one city hex.