User blog comment:Nagamarky/100% elemental effect chance is nonsense./@comment-1729807-20100414084920

The Hellfire is my main point of contention against 100% chance - for ignition as well as x2 procs. I'm not the only one who has observed the Hellfire failing to proc on many occasions.

Besides, if the legendary accessories granted the weapons 100% chance (hypothetically speaking), then there wouldn't be a need for the same accessories to give >10, even 20, tech levels (which they do).