As each dot release of ArcGIS Pro has occurred I have wondered whether or not version tags for it might be desirable.
I have been a proponent of version tags for dot releases of the ArcGIS platform (ArcGIS for Desktop, ArcGIS for Server, ArcGIS Engine, etc) but have so far refrained from creating them for ArcGIS Pro. I think there is a difference between how version tags of the two architectures might help/hinder questions to attract potential answerers here.
In the case of the ArcGIS platform prior to ArcGIS Pro I think the recommendation to always apply a product and a version tag is sound. It was and remains particularly useful when assessing options for how to answer questions at the 9.3 to 10.0 major change, and also at the 10.0 to 10.1 change which was big for ArcPy (arcpy.da, Python Toolboxes, Python AddIns). Even today many years after the release of 10.0 we still see quite a few questions using that version.
In contrast, I think the changeover in ArcGIS Pro dot releases, while just as big, and probably much bigger, than in ArcGIS 10.x for Desktop, will not see versions lingering on to anything like the same degree. I think the ease and desirability of upgrading during ArcGIS Pro 1.x means that we can almost assume a question will be using the latest version within a month or two of that release. Perhaps as ArcGIS Pro becomes more important to larger enterprises we will start to see more inertia and risk around upgrading but for now I think when someone asks an ArcGIS Pro question we can safely assume that an answer using or mindful of ArcGIS Pro 1.3 is what they will be looking for.
For now I think we should continue to use a single arcgis-pro tag for ArcGIS Pro and reassess whether it may need version (and perhaps dot release) tags when it eventually gets to a 2.x version.