RE: RFC: Flavors - naming significant sets of customizations

[Drew Adams]

> However, themes are not very 'hygienic' -- you cannot easily roll back a
> whole theme; when you choose a new theme, it works on top of the already
> chosen theme, with all the non-overridden settings still active.

Actually, you could, with the _color_ themes that inspired Emacs's
_custom_ themes.  See Emacs bug #15687:
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=15687

This was one thing that Emacs did not get right wrt themes - a major failing.
So far, at least.