I can see this comment was downvoted because it doesn't address the main point but Circle to Search is genuinely a good, helpful feature. It allows you to copy or translate text in two or three taps, even faster than if you had selection power, and I hope more platforms add similar functionality (even if just to work around the current terrible state of text selection).
I heard that it was a "mandatory dependency" to mitigate "insider risk" or something. There's no way it's going anywhere. Odds are they'll just enforce even slower rollouts "to catch things early".