The thing with clicking is, it isnt as dramatic to click in Bgs, since u basically do PvE and rarely have to react rly quick to some situations, being rly good with keybinds shines the most while playing 3s, when u click in 3s, u are missing a lot of potential of ur class, especially as a MM. Hes trying to make clicking sound bad, because it is, like I said, u are missing alot of potential of ur class when u click. Its not a lack of "skill of hand/eye coordination" I stopped clicking at the end of TBC and when I try to click now, it just feels clunky and inefficient and thats exactly what it is, try to play with keybinds for 1 month, I swear to u, u will never ever go back to clicking and u would 100% laugh about ur current point of view about clicking. Here a video of Braindeadly in Cata, u wouldnt be able to do half of his **** while clicking.
https://www.youtube.com/watch?v=3z_XozRwEGA