My (limited) understanding is that template-haskell is not reinstallable for the same reasons that base and ghc-prim aren't reinstallable: the GHC codebase directly wires in several definitions several functions, types, and data constructors from template-haskell. See THNames [1]. If one were to, say, use GHC 8.6 but install a different version of template-haskell than the one that came bundled with 8.6, then it's almost certain that lots of code in THNames would no longer work, since they could be referencing identifiers that no longer exist (if the new version of template-haskell doesn't have them).
Ryan S. ----- [1] https://gitlab.haskell.org/ghc/ghc/blob/25c3dd39f7d446f66b5c967be81f80cd7facb509/compiler/prelude/THNames.hs
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