It is actually faster to get to downtown SF from downtown OAK on BART than it is to get to downtown SF from the Sunset, Richmond, or even lower Haight on Muni.
This is very true. I live in inland east bay (Walnut Creek) and my BART commute is still a few minutes shorter than my MUNI commute from when I was living in the Outer Richmond district.
I cannot figure out why more startups are not based in Walnut Creek - lots of office space, a great downtown & there are two BART stations within 5 mins + the contra costa transit center.
I said BART. BART is even faster from Oakland during peak hours because there is less time between trains. I gave away my car when I lived in lower Haight because I had no place to park.