Trying to have a better understanding of the game.

So I have been playing this game for 6+ years. I am an adc main. Or well used to be. Due to the hard changes in items. It's hard to adjust to the new items. You go from having a 2 item power spike to needing 3 items to even do damage. And I understand that ADC's were really strong. But let's take a look at AP mages and Ap items. How many AP items give defensive stats ontop of a shit ton of ap. How many AP items have special item actives that increase their damage or burst. Like I see so many people complain about adc's and How much damage they do but you have a Building a And doing 500+ Damage. I had an Annie build luden's and her Q which requires no skill to use walk out of a bush and do 500 damage. But ADC's are the problem. I just feel like this games going to complete crap. And riot doesn't care cause they have made all the money in the world. I just don't understand where this game is going and why the adc's had to be nerfed but they just keep giving AP mages and other AP scaling champion's more items and buffs. Why can an AP build one item use one skill do 500+ damage but an adc can't have 2 items and do just about the same damage? Someone explain?