I'm very much in favor (as will surprise no one), but there's a new proposal process. Open an issue at https://github.com/haskell/core-libraries-committee/issues

On Fri, Jan 14, 2022, 2:06 AM Andreas Abel <andreas.abel@ifi.lmu.de> wrote:
Proposal: export liftA2 from Prelude.
More information and discussion here:

   https://gitlab.haskell.org/ghc/ghc/-/issues/20945

Discussion period 2 weeks

TL;DR

- Fixes weird qualification in warning

     • No explicit implementation for
         either ‘<*>’ or ‘GHC.Base.liftA2’
     • In the instance declaration for ‘Applicative <Foo>’

- Was considered for GHC 8.2 but never followed up
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