Among my iPhone-owning friends, it is common to hear “they didn’t add X to Safari in iOS 16 but I hope they will in iOS 17” or “did you watch the iOS 16 promos? They’re adding X to Safari.” It is expected that major Safari features coincide with major iOS releases.
I’m not comparing the features of iOS Safari and Chrome on Android. I’m just saying they approach the release schedule differently, like the exec said in the email.
Or they release them at a faster cadence, which was the point of the quoted portion of the emails. That doesn't mean no planning.
EDIT: Actually, I reread your comment and have no idea what you're getting at. Why do you think I'm suggesting Google has no planning?