I'm not sure where you got 1.6k-2k. 1.2 sounds a lot better lol, maybe even up to 1.5.
Anyways, crit was a dedicated build path back then. If you wanted to crit a lot, you built a lot. Now there are LOTS of options to get crit so you'll see lots of ADCs always critting, making Draven seem not as good.
Also Draven dodged the ADC update. The good ADCs were mostly given nice utility and damage increase options. Draven has to juggle axes. It's easier to play Cait who can easily proc head shot, shredding through 50% armor and critting from a huge range, or Lucian and stacking Fervor very quickly while having amazing kiting, or Vayne who starts a clock when she fights someone, guarantee killing them in a certain time span, or Jhin who gains massive AD and execution crit damage accompanied with godly mobility come late game. Honestly, it's mostly Jhin in my opinion. Jhin is far superior to Draven doing the same things. Huge, late game nuking damage. Extremely long range support (Ults), better CC though more situational. Draven has more burst but Jhin doesn't require micro to Draven's extent and can get more damage done.