even after the buffs to other stones. why wouldn't you get thunderlords?

why? deathfire touch. 25% AP ratio. how much you'd have to have AP in order to get more than the 180 + 10% Ap from thunderlords? can someone smarter than me find the minimum AP required to do this. not to mention DFT is a DoT unlike the thunderlords which is just free damage. I mean if you have. 1000 AP (which unless your veigar you prob won't get anywhere near 1k ap). thats 250 Dot on the deathfire touch. or. its 280 from thunderlords. does riot have any logic at all? even more so on the physical side because if your an AD champ you want IMMEDIATE damage? am i missing something here. why does thunderlords have this much base damage while DFT doesn't. not to mention dft decreases damage for AOE or Dot damage. while thunderlords doesn't. i mean need I say more?. you need unrealistic amounts of AP to make DFT worth it on most champs. and early game or at any point of the game. its still better to use thunderlords. sure. dft has no cooldown. but who gives a shit. early game almost no damage. mid game. still almost no damage. late game. meh damage. i mean its so easy to mitigate DoTs late game or at any time outside the laning phase.