While the occasional confusions in conversation can take a moment to sort out, the lack of identity may be more purposefull than simple laziness.
A consistent pseudonym builds a history and becomes an identity, which is the opposite of anonymity. In a world where name counts for far more than substance, being able to truly have no name creates a unique situation where comments can be evaluated only on their inherit merit, or lack thereof. Being unable to tell who said something is the most logical extension of the advice to "never believe everything you read on the internet". What's overlooked is that in the majority of cases it would also be sound advice to "never believe everything your dance teacher tells you simply because they are your teacher" - and deciding which case is which is another of those situations where there is no one you can reliably believe.
No information is worthy of belief simply because of who is saying it - everything is just a raw theory until substantiated by some more concrete evidence. Being able to present information, or theories, or opinions, in that context has more value in terms of building actual skills for the study of dance than doing so from a perspective of authority, even that of an authority built of nothing more than a reputational collected over a series of postings. It does not matter if an unclaimed post is initially believed or not - if it only plants the smallest suggestion of an alternate possibility, the reader's own future consideration of it can lead to a more informed position. Regardless if that decisions is to retaining the original view or accepting the new, the act of coming to a decision is a learning process.
Of course Jonathan can configure the board to require a name to be typed.