That GHC might reject an older version of base isn't a reason to switch for every GHC release, is it? I mean, if it breaks then sure, require a newer base. But

That GHC might reject an older version of base isn't a reason to switch for every GHC release, is it? I mean, if it breaks then sure, require a newer base. But in my experience GHC (thankfully!) doesn't change the semantics of Haskell often enough to warrant a new version of base for every new GHC version.