Exposing user names is not a concern for an external community because guests can view People and whatnot anyway. It's a poor experience to have a prominent "this tile can't load" section because it looks like it's broken.
Reviewing through your description, that change would also impact guest users as they are a type of external users. That being said, if you are interested in this type of feature being added to a future release of the Jive platform, I would suggest submitting an idea to the Ideas for Jive space where our Product team reviews through top rated ideas when considering enhancements for future releases.
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