Telemetry isn't okay simply because it can't be used to track someone. The number of tabs I have open isn't identifiable information, but it's still my private information, and should not leave my computer without my advance consent. Using my computer hardware to transmit my usage activity (even my unidentifiable usage activity) without my consent is a dick move.
My usage data is mine, as is my hardware and network connection.
My usage data is mine, as is my hardware and network connection.