Now that we are in October, there's much more improvement and care for the parklets. The barriers are not getting bent, new plants are flourishing, and the newest change, the return of the solar panels.
Supposedly, the solar panels are supposed to power up the free wifi for the parklets, but I haven't tried that out for myself.
The reason why they were originally removed is because they were dangerous trip hazards. They were placed in the middle of the width of the parklets and their base stuck out like scissor blades.
They are now back and while they still have their trip hazards, they have now been relocated to be the closest to the barricades that separates the parklets from the vehicular and Cable Car traffic.