Why has the month been removed from the joined/profile creation date when viewing a potential guests profile?
When recieving booking requests and inquiries we (and I would assume many other hosts) often click on the guests name/profile picture to view their specfic verifications and past reviews. For guests with no reviews, we found the join date listed under the guests name (ex. Joined in June 2018) to be an extremely useful piece of information. If the current dated was July 5th, 2018 and the guest had just created their profile in June 2018, we would use this information to help determine if they would be a safe/suitable booking. The guest might be new and reputable or they might be booking to use the rental for illicit activities, and the month would allow us to determine whether or not to approach the guest with certain questions.
The join month also aids in knowing how much information to give guests, such as offering more information or guidance to someone whose profile is only 2 months old and may have not used the site verses someone whose profile is say 6 or more months old.
The join date appears to have changed today from listing the month, "Joined in Month 20XX", to simply "Joined in 20XX".
Using the inquirey I just received as an example, the profile says "Joined in 2018" (It is January 26th, 2019 at the time of writing this), I have no idea if the profile is 3.5 weeks old or over a year old. The profile has no picture and 2 verifications. If I had the join month, say it was December 2018, I would be able to scrutinize this booking more, both for my safety as a host and offering adequate information to the guest. If I had the join month as January 2018, I would know that this person has had their profile for an extended amount of time, either they heard of the website, created a profile and didn't use it, but they are still aware of Airbnb over the past year, or potentially they have used it once or twice and not received a review.
Either way the join month is an important piece of information that should be listed on all profiles, guests and hosts alike.