Humane and Rabbit’s buggy new AI devices are merely the newest examples of an enduring trend. Plus: requiem for the home button.

Two gadgets in technology’s hottest new category have shipped. They arrive with great expectations, in part because their makers have promoted them with Barnumesque aplomb. But both are missing basic functionality. Worse, some of what is there doesn’t really work. Despite promises of updates to come, they get dismal reviews, an albatross that’s tough for...

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