The spago.dhall file has this comment added automatically:

{-
Welcome to a Spago project!
You can edit this file as you like.
-}

Should this comment be removed by default? It doesn't add anything besides notifying someone unfamiliar with spago and package sets in general that it's a Spago-related item. However, I feel like Spago has become more of the norm now that even that reason isn't much of a reason now.