In an ideal scenario, all objects that can be created by a user where they're "owned" by that user should be able to be reassigned.
Some of the objects that come to mind are: Lists, Views, Groupings, Reports, Dashboards, Custom Forms, and Custom Form Fields.
We've found that this has become an issue with some of our Administrators moving into different roles, where they won't necessarily require access to these objects anymore.
This is even more important when these objects are shared with a large number of users, so it does not make sense to simply delete and re-create - as it would cause an enormous amount of work for administrator within Workfront.
It's also a bit disappointing that others who have raised this idea, have simply had their ideas archived or dismissed without a response from Workfront or the relevant product owner.