We've done a lot of legal work recently to accommodate as many different people as possible, especially with our 50th Anniversary coming up next year. It's not that we don't "let" people from other organisations train (at least in the dojos I've been to!), it's figuring out how we can cover them (and us) for worst case scenarios.
More an observation of the closed nature in Aus than a criticism of Aikikai Aus, I've noticed it in more than one group, and really noticed the difference training in the US. Interesting to hear Aikikai's reasons/limitations. Really interested to see how opening up to "outsiders" for the 50th anniversary goes, as I'll be back in Melbourne next year