Focal Guilds/non-Focal Guilds has gone the way of the dinosaur, so says Maecius (and as recent Forum organization has reflected). Get it?!? Dinosaur, Maecius, Barney....?!!?!?
Geez...what do I have to do for this crowd?!?
Anyway...should we have Official Guilds even? I mean, a Guild would be an established organization with a base of operations (Guild Hall) and some official recognition by the regional government (or, if they WERE a government, like the Zhentarim are within Castle Darkhold). All other organizations of PCs are and should be considered Factions.
Guilds & Factions...that is a distinction but by no means by itself says one is better than the other, especially since both are made by Players and thus either is great by that fact alone.
Should DMs focus their support to Guilds, or Factions, or both? A personal preference would be to see DMs focus on: Campaign(s) > Guilds > Factions. Thus, the energy of the DM Team and its abilities goes to the Campaign, the Campaign is really setup to provide agency to the Guilds...AND, provide agency to Factions, considering that...wait for it...multiple Guilds could be a Faction!
That all said, I also have a personal preference to Canon Guilds, because I appreciate BGTSCC as a Server that follows, caters to and upholds the Forgotten Realms Lore. As much as possible. Obviously, the BGTSCC Server is just as rooted in custom Lore and thus, non-Canon Guilds. That's cool. But I still think Canon and Lore should always be given first dibs on development.
In the long run, and by looking into the past, there really should not be any division of DM attention to one "way" or another, as in just cater to Guilds, or just cater to whatever group is most active, or just cater to...X, Y, Z. That way of doing business probably is the least desired because it is far too easy to say "that's a type of Favoritism!" *yawn*
But I'm really now pushing an agenda of making DM Team effort be about making Campaigns (in the grand honor of the Amn/Gate war for example) where Guilds + Factions + Individuals are invited to join within the organization of their Guild/Faction or solo, and CAN join into the Campaign under their Guild/Facton or Solo (in grand honor oth the Amn/Gate War for example!

), and with the resources that each of those types would provide to effecting the Campaign.
DMs juggle the requests as they relate to the Guilds/factions/soloists attempts at RPing the Campaign. And...the Campaigns don't have to just be 1-year Campaigns, they could be much more complex and long-term than that!
Maybe I'm off-track here, and DMs just prefer to run little events with not much Server consequence. And in general, I think all Players can appreciate it when DM is around just making the more static parts of the Server (mobs, NPCs, quests) come alive "in the moment" with a bit of interaction. Actually...I think we all love that!
But it seems that if you have a Server Campaign, and individual DM campaigns, and then 45 Guild "campaigns," and non-consequential DM Events, and Guild/Faction mini-requests, and solo PC requests, and backstory requests, and this and that and this...
...you hopefully get the picture. It's impossible. It's a nightmare, really. That is NO FUN. Game = fun, right?
Right?!?