I imagine they must be the In-N-Out Burger of DMs; their limited menu is made up for by being
really good at running games for the character types available.
I think that's not too far off. About 14,893 comments ago in this thread (numbers are approximate), I brought up the "Asian fusion" example.
But another way to think of it is ... well, I remember that in the late 90s, I had a large group of friends, and we would get together to eat. Now, if there was a subset of us, we would go to get authentic food at some hole-in-the-wall, and this was pre-Yelp (pho, sashimi, Ehtiopian, etc.). But if all of us were together in a massive group? No way. We'd probably end up at a Cheesecake Factory. Not because their food was the best. But because everyone could find something they liked. Pizza, salad, Asian fusion, burgers, tex-mex, etc.
We often think about this in terms of our personal experiences as well. If I show up to a random sushi joint (Sushi-2-go), I'll just order what I want. I'll have it, to quote the King of Burgers and Frank Sinatra, MY WAY. On the other hand, when I go to a really good place (like the sadly closed R23, or Morimoto's, or Nobu, etc.) I'd get the omakase. I want to see what the chef is making! I want to partake in the experience!
The analogy isn't perfect, as TTRPGs are participatory in a way that fine dining isn't. But the basic impulse remains the same; something that is curated, that has a purpose, can be special.
As I have written many times, I would much rather play with a DM who is invested. Who cares. Who creates an omakase. If the DM is taking the time to invest themselves in world creation, I want to give that a try. Because there will always be other games*, and I can always find an "anything goes campaign," and try some character concept another time. But invested DMs ... those are hard to find.
*Admittedly, as the skeletal fingers of time close in around me and I no longer buy green bananas, this statement may not be as true as it used to be.