What in the world? No it is not.
Yes, that's what's stopping local governments building more mass transit, it's all those regulations imposed by the pesky local government!
EDIT: Rate-limited, so read response to request to elaborate below
San Francisco has multiple entities involved in the process of policy relating to transit. So, while the SF MTA and Jeffrey Tumlin may want more rail (perhaps underground), more buses, and fewer car thoroughfares there are also supervisors in charge of local districts who may oppose construction on grounds that they will hurt constituents.
As an example, supervisors David Campos and Hillary Ronen at different times opposed the bus-lanes along Mission St. on various grounds including (paraphrasing) "speeding up transit does not improve things for the local community", "the transit lanes lead to gentrification", "local merchants will see decreased foot traffic".
That's just an example and the details are too numerous to list here but consider also that the SFFD opposes Vision Zero.