Your arguments are not backed up by anything.

> gentrification and displacement

These are not actual issues with regards to housing being too expensive. These are pet issues divorced from economics.

> the slow and unproven trickle-down effect of market-rate housing

This is absolutely proven in the data, and even a basic thought experiment using the pigeon hole principle will show that more houses means the prices drop of existing stock.

> critical need for direct public housing to serve low-income communities

Why is this a critical need? More housing being built could also mean more public housing, but removing zoning and land use regulations doesn't hurt this.

It seems you are more disappointed that your personal pet political issues are being ignored in favor of a market solution to house prices.