Thomas Dalton wrote:
I am sure to have seen templates displaying the result from a template.
Templates which transclude templates are another matter entirely, and not one I believe there are any major problems with. We're talking about articles which call a template, the name of which is the result of another template. I've never seen that.
Happens all the time in Infoboxes and the like, where you want to be able to parameterise almost all of the display: colours and so forth. Also the various little flag icons you see around the place are IIRC implemented in such a fashion.
Bear in mind that a template which transcludes another template isn't actually doing much unless it's in an article, so that's the context in which most of this discussion should be viewed.
HTH HAND