Even with all of these new features, it's worth noting that these beta builds for members of the Insider program are not without their bugs. Microsoft fixed a number of problems with this build, including allowing users to keep playing audio in the background when apps like Microsoft's Groove music service are minimized.
The bottom line here is that only people who are confident they can take the bugs along with the new features should opt into Windows Insider builds. That's not meant as an elitist statement -- just a warning to people who need their devices to work as reliably as possible.
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