The Mail App in iOS 13 does seem to work better. It contains a few new improvements, but some of the Settings are kind of hidden. This article describes the Mail Apps Archive and Delete functions, how to set up swipe functionality and what they actually do. If you are an Apple Mail user in iOS 13, then the article may help clarify some things for you. I am using the Airmail App on my Mac and in iOS, but I do believe most iOS users are getting their Email through the Mail App.