Developing in SwiftUI is lightning-fast - there are a few bumps and bugs that have been extensively discussed, but it's really simple to still use UIKit components in the places that need them (which are becoming fewer all the time).
For me the tone of the article is very 'positive' but the amount of time and effort seem horrendous. And now they're stuck with React. Not sure how many times these articles need to be written and then... [0]
[0] https://www.twopicode.com/articles/this-is-why-we-stopped-us...