I would like to revisit Formatting tags relating to version numbers? from the early days of the GIS Stack Exchange from a slightly different slant.
When ArcGIS 10.0 was released there was little need to be precise and tag using arcgis-10.0 because ArcGIS 10.x came in just one flavour and arcgis10 was self explanatory. However, since ArcGIS 10.1 was released, lots of ArcPy questions can now be answered quite differently if the asker is using 10.1 rather than 10.0 or 9.3 or ...
I would like to propose that when arcgis10 is entered as a tag, that it be synonymised with arcgis-10.1 so that a solution is first approached using the current version. If the asker is using 10.0 or 9.3 then that will put the onus on them to inform us that we need to think about only options which were available with an older version.
Note: I do not advocate the use of Service Pack tags such as arcgis-10.1-sp1 unless perhaps a problem is encountered where that becomes highly relevant and needs to be highlighted.