I am taking the question to be whether anonymity of users is importantly beneficial to the Mi Yodeya community. The importance to individual community members of their own anonymity is, as far as I'm concerned, their own affair.
I believe that it is useful to the orientation of the community that there are many users who provide valuable content without revealing their real-world identities or credentials. As I explained in an answer to a very early related question, one of the benefits of allowing anonymous participation on Mi Yodeya is:
- To underscore the point that if your argument is well-reasoned, founded properly in the sources, and well-presented, it really doesn't matter who you are in an informational (i.e. not for professional advice) forum like this one.
In addition, given that we do allow anonymous participation and want participation from people who prefer not to share their identities, the presence of active users who don't share their identities makes it clear to such potential new users that such participation is accepted by the community de facto, and not just de jure.
On the other hand, it is also useful to the community in various ways that some users reveal their identities:
Site promotion: If new prospective users are introduced to Mi Yodeya in the context of seeing clearly that someone they know is an active user, that could provide some motivation for joining the community. When I founded mi.yodeya 1.0, I intentionally did so under my own name for precisely this reason - so that I could bootstrap the community by inviting friends and family, who would choose to participate partly as an expression of friendship to me.
Building community: There have been some meetups of Mi Yodeya community members, which I like to think are useful for strengthening the community atmosphere. Coordinating such meetups is facilitated by at least one coordinator revealing his/her identity online and more or less depend on participants revealing their identities to each other in person.
Sharing experience: In many cases, both questions and answers (such as the one cited in the question here) benefit from the inclusion of the author's personal experience in life or studies. Such inclusions naturally leak at least fragments of information about the author's identity. Community members who attempt to maintain strict anonymity may feel compelled to exclude or severely mask such information, potentially depriving our readers of the benefit of germane, useful experience.