
Arnold provides practical tips for preparing drinks by the pitcher, making homemade sodas, and building a specialized bar in your own home. For devotees seeking the cutting edge, chapters on liquid nitrogen, chitosan/gellan washing, and the applications of a centrifuge expand the boundaries of traditional cocktail craft.
On the rocks is somewhat different, as it will dilute the whisky progressively as it melts, until it's lost most of its flavor. Chilling the whisky also reduces our ability to taste it, as our tongue is less sensitive when cold.
(If you're interested in the science of how dilution and temperature affect our experience of drinks, I highly recommend Dave Arnold's book Liquid Intelligence).
But Dave Arnold's slogan is "you're an enemy of quality", a title you can obtain by doing almost anything differently than he might, including not precisely measuring the displacement of ice and water before mixing a G&T. He calls things "garbage products" all the time. He is far, far more opinionated than Kenji is.
If Dave's opinionated demeanor isn't a problem for you, then opinionation (is that a word?) isn't really your problem with Kenji.
I highly, highly, highly recommend Arnold's book, Liquid Intelligence.
You can take this even further, too: I make a variation of the Mai Tai that's topped with a foam made by blending egg white with passion fruit puree. The foam is the first thing you taste, so you immediately get hit with the sharp, sweet-tart flavor of the passion fruit, before the rest of the (more subtle) flavors kick in. It's delicious.
(I've done it with aquafaba and it works almost as well, although I've only used canned, which generally contains salt. I don't mind it, but it doesn't work in every cocktail.)
[0]: If you're interested in this stuff, I highly recommend the book Liquid Intelligence by Dave Arnold.