I've yet to see the YIMBY who rallies everyone in their building or on their block together and collectively agree to be voluntarily displaced so they can demo the building(s) they are in, build one that is taller, and move back in several years later.
I've yet to see the YIMBY who comes to a planning meeting and votes to have lot directly next to them rezoned so they can deal with construction for the next two years. I've yet to see the YIMBY who just purchased a home at the height of the market with a view of the GG bridge and who then votes in favor of rezoning the lot across the street so that it's taller and higher density than their unit, which blocks their view, natural sunlight, and decrease their property value.
All I see is people who live in Oakland trying to rally people to rezone areas of San Francisco. Or people who live in The Mission trying to rally people to rezone the areas around Golden Gate Park.
We need more housing. There are areas that, from a planning perspective, should definitely be rezoned for higher density housing. But the people who already live there don't want that. And well, they live there.
One of my favorite areas in the city is the Sea Cliff area. The one mile stretch of land that faces the water contains only about 30 homes. Half of them are vacant because they are investment properties. On any given there are probably like 20 or so people on those cliffs. That same amount of land in NYC would house thousands of people. But if you want to take the YIMBY movement to the extreme why don't go ahead and try to rezone that area. Displace a few dozen extremely rich people and we can house literally a thousand families.