Matthew Pickering proposed to make Q (TExp a) into a newtype called Code. 

Proposal #195: https://github.com/ghc-proposals/ghc-proposals/blob/22e97d7693edb0b3676c948a123e57ea93c462e3/proposals/0000-code-texp.rst

Pull request discussion: https://github.com/ghc-proposals/ghc-proposals/pull/195

It looks like the motivation behind this proposal boils down to the convenience of writing instances which seems a good thing. The minor problem I see is the proposed name "Code" as it looks a little bit too abstract for Typed Template Haskell expressions. Nevertheless, I recommend to accept the proposal as it is. Silence is understood as agreement.

Regards, 

Vitaly