For example, the question:
Plotting Smith and Sandwell global seafloor topography grids in ArcGIS Desktop?
originally had a title with an ending word of 'GIS', but the question body says it is specific to 'ArcGIS'.
Is it appropriate to edit the title to change from GIS to ArcGIS?
If the question had an ArcGIS tag would that change the answer?
Yes - the question title should accurately summarize its contents, irrespective of any tags used.
As indicated in this answer to Framing (asking) good Questions for GIS Stack Exchange? our focus is on getting all relevant content into the body first, summarizing that in the title next, and as the third priority providing suitable tags.
I think the current title of Plotting Smith and Sandwell global seafloor topography grids in ArcGIS Desktop? summarizes that question's contents better than the original.
However, it is important to note from that question's revision history, that making a minor edit to a title is best done in conjunction with other edits, in this case to both the body and its tags.
Prior to that edit the title said GIS (generic), the body said ArcGIS (platform specific), and the tags were even more generic, mentioning neither a GIS product nor a GIS platform. With the edit the title and tags were made product specific (ArcGIS Desktop) and the body had some grammar corrected.
If a question is tagged arcgis-desktop there is no need to include the software name in the title, because as it was said by @Mapperz tags are also searchable.
My main point is, unless there are other substantial edits to make, there is no need to edit 'GIS' by 'ArcGIS' and bump the question to the active page, and so removing visibility from new answers and questions with substantial edits.
If one is going to edit a question to make it more readable, to fix typos and grammar, to include proper tags, etc, or if the question was just asked (let's say recent 5, 10, 15 minutes); then, to edit like you suggest will be a matter of preference.
We need to be cautious with Meta posts about edits, because people can read this and think it is ok go massive editing posts to include the software name in the title, when the question is already properly tagged.
