[kalleboo]

> the people working on these projects are not dumb. They are not going to launch a feature that simply does not work

I've seen no evidence of this. Plenty of features that do not work or work poorly are launched every day.

Especially machine learning stuff, which is hard to test for normal (and abnormal) users and debug the recommendations. See e.g. the Nest. I know people who got one and hated it since it never get the hang of their schedules and would make bizarre decisions. Others love them.