Not that I mind more conversion support but basically what you are saying is that Sigil of consumption has excellent conversion support and you want more.
Meanwhile many skills lack even half of that(Like for example DEE).
sigil doesn’t have the support, just the damage types can be converted. Which means any skill that uses fire, chaos &/or Vitality damage have the same conversion support.
Dee’s vitality damage can be converted to Fire, Cold, Physical, Aether, Chaos
It’s Acid Damage can be converted to fire, cold, Pierce, Vitality, Physical
So as you see it also has many options and it to would benefit from vitality to lightning damage.
It really would be good to have some form of Vitality to Lightning/Lightning to Vitality conversion, especially on one or two 2-handed weapons. It’s too bad to see Brute force going unused on Ritualist and Conjurer builds, and the most (if not only) viable option atm is Decree of Malmouth