no good reason. (bad) names could be revisited if there will be 1.0.0 to clean up things.

good thing is that you can always already add these to the registry:

:vector-of (-collection-schema {:type :vector-of, :pred vector?, :empty []})
:set-of    (-collection-schema {:type :set-of, :pred set?, :empty #{}, :in (fn [_ x] x)})
...

efficiently - you should loop the registry and create a map of name -> m/validator of it. Validators are pure functions and can be cached.

See https://github.com/metosin/malli/blob/master/src/malli/provider.cljc#L15-L16 for example

maybe therw could be a helper for this in malli.util?

This might interest you https://github.com/esuomi/muotti @UFTRLDZEW

Yes, it looks like much more fully realized version of what I once called "https://fabricate.site/background/finite-schema-machines" - thanks for the link!