(not an answer but an elaboration of what I would want to see)
I would like to be able to say:
clojure -X:deps aliases
and have it spit out a table showing project aliases first in alpha order, followed by user aliases, then root aliases, with annotations that show if a project alias shadows (hides) a user or root alias, and similarly for user aliases that shadow root aliases.
It might be useful to show the keys in each alias so you get a sense of what effects each alias can have? Anyone who needs to know what exactly each alias contains can go look in the appropriate deps.edn
file that the report shows.