I see this kind of map update code usually written using merge, like this (ignoring DRY itch for now)

  (merge base-map
     (when name
        {:name name}
     (when address
        {:address address})

Or to avoid repeating field names, just form one map to be merged like {:name (function-that-may-return nil) :address (function-2)} and filter out nils from the map before merging that with-base-map.

I guess with cond-> you have the advantage that you can do arbitrary map transformations, not just additions, so maybe this is just a case of nitpicking a strawman example - but doing only additions is a common case too.