The recently added list for golfing tips in ECMAScript 6 sparked a bit of a discussion in the comments (and the close/reopen votes) whether tips for different versions of one language should go in the same list or whether we should create a new list. This is mainly relevant if a new version of a language is released which adds significant syntactic features useful for golfing.
There is a precedent for creating separate questions: Perl 5 vs Perl 6. But I'd prefer to have a community consensus about this policy on meta for future reference.
I will add two answers for the existing opinions along with the arguments I could find. Feel free to amend them or add your own answer if I missed anything.