Has this been reported/requested upstream (https://discourse.phabricator-community.org) yet?

In T215031#4921506, @Billinghurst wrote:

@Peachey88 is there a plan and/or timetable to migrate these other years to the other namespaces (for the previous years)? Just so we know what we are going to have to import from existing wikis, or not bother

Is this a upstream regression?

In T215031#4920932, @Billinghurst wrote:

The one thing that has been tumbling over in my mind is now that there is one wiki for many years, there will need to be the hierarchy to cover many years. In previous wikis, they could do it all one level down from root, and not have to worry about next year, that is no longer the case.

Will it be
2019/Schedule
2019/Volunteers

or
Schedule/2019
Volunteers/2019

or something else

If you do all at base level, then think that you can move it at the end then the relative links and link fixes are going to be awful, and prone to breakages. We can be looking to just have redirects at the base level so that each default redirects down, and that changes per year. Also could affect how templating is done, so it will need to considered early.

Checkuser is purposely disabled on beta due to privacy reasons, see T175197#3587005 and T104883#1431147

In T213880#4883183, @Krenair wrote:

I understand the reasoning behind this but I am skeptical about how good an idea it is to create phab projects for code that might not actually be tracking issues in Wikimedia Phabricator.

In T101131#4886836, @Tgr wrote:

Works great, thank you for fixing it!

Given that action of adding reviewers is done under the name of the uploader, so it's not entirely obvious what's going on, maybe a wikitech-l announcement would be in order?
(Or we could just ask upstream to add an option to use a dedicated user for adding reviers.)

Nope it has nothing to do with Abusefilter, its a on wiki antispam measure.