Fire weapons have pretty low damage output across the board as a general rule of thumb. They tank extremely well, but the tradeoff is to have abysmal, almost unusable DPS in comparison to the others.
My suggestion is to indirectly add more power to these weapons in such a way that cannot be easily stolen by other elements, while also reinforcing the gameplay loop they were meant to embody:
Make Thorns damage scale with melee, and make Reflection damage scale with spell.
Instead of having an inconsequential ID that contributes literally nothing to your build (unless you're Battlemonk and need 20 reflection for mana regen) it would be nice to have IDs that actually BENEFIT tanky archetypes.
It would be a much more impactful change rather than just buffing fire Mythics across the board.
Extra detail:
To avoid it being abused by healing classes I also suggest that the damage dealt by Thorns and Reflection scale inversely with the damage received as a % of your max health. That way you can't just take glass DPS Lament with 120% reflection for an absurd free damage boost.




