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The former can be a sign of healthy experimentation. The latter is just frustrating, particularly when Google paid a lot for the product in question. Groups at least partly came out of the Dejanews acquisition and seeing something purchased by a company that will be a poor steward is frustrating.
Or products that were merged in other products [1], or which had newer versions [2].
[1] Google Bookmarks, Password Checkup Extension -> Chrome, etc. [2]: Nest Hub, Nexus Phones, OnHub.
So tired of that argument.