Sorry for delayed reply.
Looks like we are going in the same direction, but there are some nuances which I want to discuss.
I am fine with removing Mindshare/Engineering subcategories. They indeed do not add much and also I generally prefer engineering folks to be more aware of what’s going on in Mindshare and the inverse as well.
But the other difference between proposals is the meaning of the tags themselves.
I think that we don’t want a forum for generic discussions about Fedora, rather we need a place to do the real work. Thus I want tags to represent not the generic topics but rather org units of Fedora which highlights that these groups actualy use the forum for regular business.
Thus in my proposal I had a more formal tag naming. I prefer #cloud-sig label over #cloud as it is not just everything which is related to the cloud topic but something which is specifically targeting the organizational structure which is Cloud SIG.
We can have additionally tags for topics, but i think we should have have dedicated tags for groups:
I’d say *-sig
, *-wg
and *-team
tags should be reserved and kept in sync with Working Groups, SIGs and Teams as org units.
And in the same spirit, it was the reason why I had a separate Service Desk/Generic or whatever category. Because in my vision the Discussion is not just Discussion it is a coworking space. And all meta, social, off-topic tech and non-tech things while important they should happen outside in the kitchen area 
I think that if we are to make forum a true replacement for mailing lists we need to treat the discussion topics a bit more seriously and therefore moderate with more strict rules.
I would also have a SiteFeedback or Help category somewhere on top. Because for newcomers the tagging structure might be confusing and it would be nice to have a clear path for getting help.
So for me it would be somewhat like:
* News
#announce #commblog #podcast
* Site feedback and Help
* Work area/ Working Groups / Really Serious Business
#cloud-sig, #qa-team, #ci-sig, #eln-sig, #join-sig, #council...
* Specific Workflows [muted by default]
Fedora Magazine Article Proposals
Projects in Copr
Automated Meeting Invites
* Water-cooler (Tech and non-Tech fun)
Includes #magazine (every published magazine article)
* CentOS
[tags as determined by CentOS, in a separate tag group]