In my opinion bottom sheets are actually a far superior experience to the previous pattern of dialogs/modals or push screens:

- The user doesn't lose their navigation stack because they can tell the bottom sheet can be dismissed, they know where they "came from"

- The user keeps visual context on whatever triggered the bottom sheet, because they can still see what's behind it

- The user doesn't get forcibly navigated away from whatever they were browsing, they know that once whatever they're doing in the sheet is done, they can "go back".

My only complaint is that Apple added them to stock apps in iOS 12, so many iOS users got used to the pattern, but didn't provide an easy way to give the same experience for developers which creating a need for libraries like this.