The biggest challenge I see of existing well-executed public transit/cities is last mile coverage for handicapped/disabled folks and sufficient infrastructure for them in stations without having to resort to uber/lyft for <1mile transit. If Bird/scooter industry expanded into solving these problems I would greatly celebrate. I get frustrated seeing Bird celebrated as the next coming of the steam engine, when it barely moves the needle for regular transit, without remotely addressing the biggest long-standing issues of the space.