I do agree to some extent, but were GUIs not made specifically to reduce so much reliance on the keyboard? And a few people here did mention that this "fully keyboard-driven" workflow would probably be used by power users primarily.

Like anything else in life, I think there's no single answer to this.

But for people interested in seeing the difference between mouse-driven vs keyboard-driven flows while web browsing, check out the Vimium extension. It made my sentiments very much favour keyboard-driven workflows