They were talking about allowing the construction of ADU's to accommodate "low income" people per the RHNA - Low Income in San Mateo county is a 2-person household making $117k/year or a family of 4 earning $146k/year. I don't think you need to worry about pee on the sidewalks and "smoking".

https://www.hcd.ca.gov/grants-funding/income-limits/state-an...