Nothing is preventing any testers from sharing whatever they want about the experience.
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Per my discussion with them, TR’s preference is for all current beta testers to use the main announcement thread at the moment. That is the only preference that they have stated.
At some point (not disclosed directly to me), they plan to create a dedicated “experience” thread for everyone to use from that point forward. But for now, they can use the existing thread, as several people (me included) have already done.