That can be said about anybody. I'm talking about streamers not pro players. Besides, a smart pro-player wouldn't call out things like Kalista-Thresh because then what would they lane as? That's like a mid main complaining that Fizz's hang time is too long and that his AA shouldn't happen until the animation is completely over.
Quick Fact: Most people bind "Hold" to a button on the side of their gaming mouse so that they can cancel their own animations and chain them quicker than would normally happen. Animation cancelling is not cheating, and is sometimes referred to as weaving.
Do I find pro-players to be dumb? Some are smart. Do I find pro-player streamers to be dumb? Yeah, a lot of the time. They talk non-sense 100% of the time and their crowd licks the gum right off the streamer's shoes, metaphorically.
So how do I find that the skill of these people lacks anything at all? Because the lower 98% of players severely lacks any skill, competency, or decency. A pro-player at this point is someone who is the top of the severely lacking, between the top 2% and bottom 98%, and people who play games for a living, albeit LoL, DoTA2, etc...
But who am I to call people dumb? Nobody really. I'm just a mechanical engineering student with an unrelated degree in manufacturing. Dumb is a consensus that I feel should be shared, but typically isn't. You don't share the same definition of dumb as I do, so I understand that you don't agree with anything that I'm saying.