Google is trying to ensure that all of their apps look cohesive and work in a same manner. It is the reason Google is bringing Gmail app’s old customizable swipe actions to latest Messages beta. With Gmail you have got loads of options and you can swipe to snooze emails, mark them read r unread, delete them or archive them. At the moment the stable build of Messages only archives a message whether you swipe left or right on it. But it is changing now for the beta users and the new Messages build starts to give the users the options to configure different behavior for swipes. Both left and right swipes are customizable and you can pick from two actions deleting thread or archiving it and just doing nothing at all.