Another interesting point delivered with some panache @jidanni. 
The version number of a Discourse site represents the exact commit to which it has been updated to, and can change multiple times a day depending on how often a rigorous admin wishes to be as close to possible to the latest version. To a regular user reporting problems it is not particularly relevant information as they would be reporting any problems to their site admin who would have that version information on their dashboard.
As for the ‘Powered by Discourse’ information, it is something that has been considered as it would get our name out there more widely (which is no bad thing as far as we’re concerned ). We do feel that the Discourse skeleton is relatively recognisable, but perhaps having a little somethin’ somethin’ extra would be useful. 