[johnotander]

I'm with you 100% with the preference for the ability to completely undo any action. That is a more preferable experience.

However, as also mentioned by atian, it always depends on context, and what's available to you. There are situations where I'm writing an app that won't have the ability to "undo" deletes for particular objects. This can arise from API restraints, unnecessary overhead for a trivial object (todo list item as a contrived example), etc. Those scenarios are what I use the deleted library for.