Top paragon level players are not botters. If you play legit in a group of 4 and farm speed GR you will get 5 times more xp than what the best bots can do. Whole arguement is pointless.
People express their dissatisfaction with the system because it's flawed. It forces people to farm the same content 24/7... If there was a balance between the different types of content in the game in terms of xp gained, then people would be able to farm different types of content without feeling forced to farm just this ONE THING. That's the main problem that many people seem to be missing. Botting has nothing to do with this.
Also, if someone bots and gets really high plvl, he will get banned. In EU for an example, there aren't more than a few thousands of people who are close to or are above plvl 1k... Botters can be spotted quite easily if they go overboard (and sometimes even if they don't).
Oh and you are wrong... paragon > skill is actually true. Please tell me more about how you can skillfully beat a plvl 2k player when you are plvl 800... yeah good luck. And you might not know, but it's not mainly about solo... In a group where the average plvl is 1.5k, this group can beat the shit out of trials or GR levels that a plvl 800 group will never be able to - or only be able to with extreme fishing and luck.
There's nothing wrong with a system that rewards players for playing the game more... The problem is that this specific system completely overshadows any other sort of character progression i nthe game and it has become the only way to actually play while being effecient once you have the gear.