I found myself a few days ago writing a getOrCreateLeafNode() method for Smack's PubSubManager [1] and noticed that Smack has a similar method for MUC (createOrJoin(), [2]). Both methods are often required, e.g. you need the PubSub one for OMEMO (or everything PEP). But both methods are inherent racy.
I believe that users find themselves often in the situation where they just want to join a MIX channel, while simply creating it if it does not already exist. Maybe this is a reason to add this as MIX protocol feature, so that libraries do not have to implement them composing join and create primitives with all the drawbacks? - Florian 1: https://github.com/igniterealtime/Smack/blob/08c228ef99b59c7c16b44941875e1ea640db3b62/smack-extensions/src/main/java/org/jivesoftware/smackx/pubsub/PubSubManager.java#L272 2: https://github.com/igniterealtime/Smack/blob/08c228ef99b59c7c16b44941875e1ea640db3b62/smack-extensions/src/main/java/org/jivesoftware/smackx/muc/MultiUserChat.java#L483
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