I really have not seen any big problem in actual play. In the only practical applications I've encountered, the 4e group and the old-D&D group agreed on the "OS" characterization -- just not on whether they liked or disliked the phenomena.
Maybe this demand for sharp definition has something to do with the degree to which WotC's "editions" are really different games, such that a group is clearly playing either one or the other -- and the more general importance in those contexts of rules defined by the books.
From that perspective, the Other is notable for blithely mixing as many as half a dozen different editions and four OGL "simulacra" -- and just as blithely changing whatever "rules" may be the result.
Maybe this demand for sharp definition has something to do with the degree to which WotC's "editions" are really different games, such that a group is clearly playing either one or the other -- and the more general importance in those contexts of rules defined by the books.
From that perspective, the Other is notable for blithely mixing as many as half a dozen different editions and four OGL "simulacra" -- and just as blithely changing whatever "rules" may be the result.