Please. This „feature“ drives me crazy, especially in a shared list.
The thing is, that the list of deleted Items is also unordered, so recovery of accidentaly deleted tasks means a lot of work.
For now I have 3 Users in Any.do and all of them dislike this behavior.
Another thing is, I have no clue what your intention was implementing this feature in Android but leaving out IOS-Users. In the IOS-App shaking is not optional.
The other way around, as the feature itself seems to be implemented already, it should not be to much work for you to make it available in IOS as well.

No completed tasks to shake off" very annoying. - A) Blocks my keyboard & have to wait for it to clear; B) it VIBRATES my phone twice which is really annoying and C)it should be USER Modifiable. Could you please give it an on/off setting. I don't see this feature is really necessary as you can manually delete the completed tasks - which serves as a nice double-check. Thank you, Peter / San Diego