Abundance YIMBYism in housing decreases gentrification. Gentrification happens when the only housing that is affordable is in low-income neighborhoods. If there is plenty of housing supply throughout a city, the demand for those low-income neighborhoods is lower.

Nothing in the Abundance agenda states that direct public housing is bad, per se. The argument is that what we need is more housing, and the only realistic way for that to happen is to make housing easier and cheaper to build, typically by easing zoning restrictions and other things like parking minimums that drive up costs.