Keybindings > Clicking. Period. Don't see how you can even make an argument out of that.
I disagree with the guy you quoted but I also disagree with you, Keybindings are not always better. The player factor is a hugely important thing. Some players have the equipment and ability that suits keybinding best and some players don't, forcing keybinding to those players who don't is going to significantly dent their performance and overall gameplay experience to the point that the small benefit earned through sole keybinding becomes irrelevant. I think an avid clicker who is paying attention will be able to complete all the content the game is offering without issues.