I'm a fan of basketball. I like watching good basketball. Can I be a neutral referee while also being a fan of basketball?
Yes, if you're refereeing hockey or umpiring baseball. Quite possibly not if you're refereeing basketball, as your biases toward what you like and-or find interesting is almost certain to influence the job you do as ref.
I think that it's important to remember that the DM in D&D is being asked to be a referee with respect to the rules and making rulings. However, the DM in D&D is also being told advice such as...
And I don't necessarily completely agree with that advice. I'd far rather it go more along the lines of* "Prepare a game, campaign, and-or setting that you think will be interesting, then turn the players loose on it through their characters to make what they will of it."
In other words, prepare the game neutrally, as if you don't know who will be playing in it or what specific characters they might have. IMO you'll end up with a more robust setting and campaign as a result, if for no other reason than you'll be more easily able to handle some player turnover as the campaign goes along.
Flip side is that if you bespoke the campaign/setting to suit the players who start out, then two years later two of them have to leave leave and two others come in, suddenly it's not bespoke to the two new ones which could leave them feeling somewhat adrift or second-class.
* - but better-worded than my off-the-cuff attempt here.
Wait? Making play revolve the characters and make the players come back for more? Tailor things for the players' preferences? How is any of that behavior for a neutral referee?
It isn't. Refereeing, narrating, and DMing neutrally should by itself be more than enough to bring the players back for more, provided you've a) given them a worthwhile setting to bash around in and b) given them both opportunity and freedom to do interesting things there.
That said, the GM in PbtA games is not described as a neutral referee nor are they expected to be one. The GM in PbtA games are meant to fill the PCs' lives with adversity and adventure. Some PbtA games go as far as describing the role of the GM as being a firehose of adversity that is pointed against the PCs. That goal is likewise at odds with something that a "neutral" referee would do. Here is how "Be a Fan of the Characters" is described in Stonetop:
The description doesn't quote, but on reading it my beef is with the term "fan". You can't in good faith both oppose the characters ("firehose of adversity") and actively want them to succeed (which is what a fan does), because if either one of those things is true the other is a sham.
Sure, because many people here are long-time players who have internalized D&D's terminology and deviations from "plain English" as normal. So when these people see other games using different terminology, it accuses these other games of a scary misuse of "plain English" while ignoring the presence of such features in their own games. It's about like someone from Culture A accusing Culture B of having Weird Custom Z while ignoring that their own Culture A also has Weird Custom X and Weird Custom Y. We tend to ignore our own cultural blindspots while noticing them in other cultures.
Of course we do. We're sitting here in a Culture A setting talking about Culture A using its own terms and definitions, meaning that if someone wants to reference Cultures B, C, and-or D it's on them to explain what they're talking about.
Were this a "General" thread, however, I'd be far more in agreement with you.