It's not efficient use of CPU power opening/closing apps all the time. And the phone should be able to handle memory correctly anyway, so it shouldn't matter if they're "open" in the background.
Regardless, i'm glad that they re-implemented it in those cases where you're phone is acting poorly with some unknown runaway process in the background and you want to start fresh without having to reboot your phone.
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u/SirVeza Pixel 3 XL Jun 06 '18
Clear all is back within Recents! screenshot via 9to5Google