Is there a need in the tags to differentiate between SharePoint workflow and the new in 2013 workflow manager that is not specifically for SharePoint? There are a few new and big features in workflow manager with SP 2013 that will make those answers occasionally irrelevant for users of a previous versions.
I feel as though Workflow Manager is specific to the installation/setup and not pertaining with the implementation and integration with SharePoint 2013. I agree here with @ghangas, at least a tag synonym for workflow 2013 would be a good idea. Plus workflow manager is a little ambiguous for those users that aren't sure what workflow manager pertains to.