As of today, GHCi's development is reasonably active (at least on the bug-fixing part), so nobody really felt the need to have a separate implementation. But if you have concrete suggestions or bug reports, don't hesitate to open a ticket on the tracker! https://gitlab.haskell.org/ghc/ghc/-/wikis/contributing#getting-a-gitlab-account
none that i know of. but ghci is also the best repl i know so... ^^
the only two major complaints i have are about the multiline editing (racket's repl is really nice there) and how it sometimes gets messed up on unicode input.
but both of those are really complaints about haskeline, not ghci itself
unicode completions, multiline editing, shell environment integration, the pkg/shell/help modes, plugins like Revise and OhMyREPL, GUI integration for vscode, the `edit` function…
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I am just a casual, humble user of the toplevel, so I don't think I have valuable suggestions to make but thank you for the link :)
ditto for multiple home units in a way that isn't super limited—and what we have is already an improvement over what I'm used to!
the only two major complaints i have are about the multiline editing (racket's repl is really nice there) and how it sometimes gets messed up on unicode input.
but both of those are really complaints about haskeline, not ghci itself