Legendaries are one thing since currently they are 1 catch and done, but everything else can be hunted continually. Also its not just "pay2win" that people don't like about iv-resetting, they don't think hunting should be made easier. Heck a lot of people got upset even when really rare pokemons' spawn rates were increased. A lot of people care more about the hunt feeling rewarding than getting that really good mon faster.