You decided that Numeric version tags considered ... OK and the 2010 tag exists.
SharePoint has big differences (Feature/Development wise) between the 2007 & 2010 version and one should differentiate via tag IMHO (same goes for a newer version once it comes out).
Right now the "sharepoint2010" and "sharepoint-2010" (same goes for 2007) is blocked. Why not create some synonyms for those instead of blocking them as 2010 is allowed.
The question you refer to was a follow up to a previous question that contained the following rather pertinent section:
Version tags are a crutch. Because these tags dominate the site, and contain the name, they are the first thing users will turn to when tagging their questions. This means users will fail to tag questions with any other meaningful tags, since "I already tagged my question with sharepoint-2003!" This isn't hypothetical. We've seen this happen time and time again. Version tags are a mindless replacement for thinking about what your question is about. "Oh, this question is about sharepoint-2010. Done."
A very large percentage of questioners will start adding a tag by typing "sha", then stop and rethink if there are no available tags.
