What I don't like about it is typical Apple form over function.
I used to use the app switcher as a tool to look back but now past apps are partially covered preventing me from looking at them. For example sometime I'll receive a phone number via text or email that is followed by another number so I can't call it (which is a problem itself, see attached image).
So what I would do is switch back and forth from the app switcher without ever going into the messages/email app. If the number is on the right the foreground app covers it preventing me from seeing it. Long press and copy then paste then back space that other number out works too but still...more of a hassle then it needs to be.