"Avoid success at all costs" is the Haskell motto, so...
> Bring all the modern stuff people expect into the standard library.
GHC already ships with lots of these, they're just not in the base package. You might find Relude [0] more to your liking?
> Language extensions are for academics.
GHC2021 happened and mostly alleviates this! But it's now one language extension that turns on everything that most people (on the committee) think everyone is fine with. We're not really going to see it becoming built-in without a new Haskell standard, and that (Haskell Prime) fizzled out due to lack of time from the committee members.