After all, the Life Visors gave the Awakened community an edge over the fake mages since their use required Life Vision.
That and Menadion's presence that allowed Lith to Forgemaster Blade Weapons for anyone fulfilled the only other criteria to be recognized as a Ruler of the Flames.
Lith, however, disagreed, claiming that he had just cracked the code, not invented the Spyglasses, and that Menadion was still a long way from catching up with modern magic.
As Marth said, Lith wasn't big on taking responsibilities with no return. He wanted to become a Ruler of the Flames, but only on his terms and when the achievement wouldn't mess with his life.
He had no time to deal with endless requests for Blade Weapons because, unlike Menadion, he would refuse to craft one if he had the slightest suspicion that it may be used against him or one of his friends.