“Code is the main cause for making computers slow.”
Fixed it for you.
A byte of CSS and a byte of JS may take the same amount of time to download.
Kent does go on to acknowledge this.
But use less, use it wisely, and don’t depend on a giant framework for simple stuff. Use as little JS as possible to get the experience you want. You can do that and still have a great, immersive app.
None of this is to pick on Kent. He’s a talented developer and educator, and I love his perspectives on testing.
We don’t have to choose been engaging apps and a JS-light experiences. We can have both.