On ios11, the app names do not show on the Dock. It is not such a big deal when you are dealing with apps since they have a large and familiar icon; but, if you have a folder in the Dock, it is annoying not to see the title/name of the folder. Perhaps, Apple didn't think folks would opt for a folder in the Dock. However, given the Dock's special role in multi-tasking and invoking apps into the Split View, people will want to populate the Dock with folders of apps.