At the moment (in 2018 R2), if you do not specify templates against a document type, the document is imported as a no content object, rather than the list of "user's default windows templates".
The default Windows templates of the workstation are not available for PowerWeb. Technically we could use the ones on the IIS server, but would that be useful?
Yes, I think that would be useful.
You won't be notified about changes to this idea.