I also agree that the governance structure for BART is weird and overly complex. Why do I elect a BART director? Why are they in their own special BART districts completely discontinuous from the 10 other ways we have sliced up the Bay Area?
All that being said, BART has done some good stuff too. The new cars really are way better, and they were not easy to procure since BART has its own weird, non-standard rail gauge. They have increased frequency and shortened trains on weekends to respond to the ridership changes.
Most of all, BART remains the only form of Bay Area transit genuinely faster than driving in real-world circumstances: it averages above 60mph in parts of the east bay, and goes from downtown Oakland to downtown SF in 11min, which is often 2-3x faster than driving. It's the primary transit system that can compete head-to-head with driving. For that reason, I do hope they keep increasing frequency (shortening trains if necessary).