The author said it perself, "the greatest minds of our generation" working at Google, so those jagged edges are surely by design, and it's the rational most efficient solution in a economy of attention where the line between the product and the user is blurred.
I saw the best minds of my generation destroyed by madness
In some cases it's just because the userbase using the web on their phone instead of the app is incredibly small and it's not worth funding feature parity. It can be difficult to distinguish this case from more hostile takes like reddit and Twitter.