In iOS 11, you don’t only have to use the dock for single apps. You can drag an app group into the Dock as well. I just found this out by “trying it out.” That makes it much more useful for app switching when you swipe up from the bottom.
I’m really liking iOS 11 a lot. It sold a new iPad to me… an iPad Pro 256gb 12.9”. I just had to have it. I can almost turn it into my work machine, but the Files app let me down. I couldn’t rename a file extension with the Files app. I needed to do that and it hosed me since I couldn’t. I reported that though :)