I will need to migrate my wiki tags when I move to VW4. Otherwise my site will be taking a large SEO hit.
VW4 without tags will be a major regression.
As XenTags is the undisputed tagging solution for XF, please add XenTags support for VW4 on XF.
Having separate tagging systems would also incur a SEO hit and would be problematic for usability as well.