Rishi Kumar brings up these points in a local article [1]. It's a good question:

"These bills will not require developers to invest in infrastructure improvement, rather only provide bare-minimum parking, avoiding costly entitlements. How will the current infrastructure — water, sewer, gas, roads — support the increased population? Who will make the necessary infrastructure investment?"

[1] https://padailypost.com/2021/03/19/guest-opinion-sb9-sb10-th...