Bungie already broke masterworking. They created competing needs on a rare material and as we can see, infusion is far and away the priority choice. Nobody is masterworking anything because it's not worth it anymore, not compared to infusion. Masterworking gives you a modicum of a stat boost to a [i]random[/i] stat and doesn't affect the gear's overall performance while infusion gives you control where your power increases go, allowing you to access higher difficulty content while using optimal equipment instead of random pieces that may only be slightly beneficial, if at all.