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I don't think you're missing anything, it is something you have to get used to. If you're building things interactively in the repl you'll have some feedback, i.e. you input a vec to a function that returns a sequence, it will appear as a (,,,).
James Henderson and Nathan Marz shares a lot of interesting insights in the following: https://www.juxt.pro/blog/sequence-mapcat/ https://www.youtube.com/watch?v=ExkzEaprHrM&t=1519s
PS. should this topic be in the #clojure channel?