Is deathfire touch a fundamentally flawed keystone?
Please feel free to correct me if or give me insight as to why i might be wrong but it seems like deathfire touch is not optimal on any champion in LOL.
The champions i see take it seem to be dot, and aoe, based mages such as brand, cassio, swain etc... . The keystone last 1/4 as long on aoe spells and 1/2 as long for dot spells. To me this seems inefficient, like building too much cdr, stats are being wasted. I get that its for sustained dmg dealers as opposed to burst mages who take thunderlords, but why make the mastery behave the way it does when most sustained dmg dealers have aoes or dots? I know that this keystone is really good on jhin and varus but they seem to be the exceptions (not to mention that they also have aoe abilities). Also the keystone favors ad champs considering it gives 60% of bonus ad over the 25% ap.
I get that the kestone is the way it is to be balanced. Ad champs have to focus more on autos than mages do so that makes sense, but why have the keystone as it exists at all? Or at least there should be an alternative to sustained dmg caster champions than this wonky keystone with limitations on effectiveness. When thunderlords came out it was so good everyone used it because the upfront dmg is good for everyone. I cant think of a single champ where deathfire touch is 100% efficient.
Akali builds ad and ap but she is a burst champ who needs tld Singed would like it but his spells are aoe dots jhin is the best fit but he has an aoe and could just as easily go for a more bursty build with thunderlords Morg could use it but she has such any easy time procing tld with her aoe dot. hell even jax could use it because its not unheard of for him to build a bit of hybrid dmg that would benefit from the ap/ad stats (and his w would pack a wallup) but every other keystone outshines dft on him.
Please let me know where im wrong on this and what you guys think


because this item synergizes so well with their kits. Champions like Karthus or AP Kog'Maw want to buy an early
and charge it as soon as possible. Some assassins want to build
against enemy mages to better survive the lane phase and mid game.
also gets bonus AD atm, though with his burst already so high, there's no real reason to take the mastery.
ofc.


and
(for the few rare people who still play Zyra mid)