I think I've only ever seen platform screen doors once in my life, on the Paris metro, and I thought they were great. It ameliorated my own personal fears and general curiosity about the tracks. Why do you think they are so bad? What if they weren't faulty? On a cursory glance on Google, I don't see much except rare cases where people got stuck(?) in them?

I feel like they would be reduce incidents of people/things falling into the tracks as well as help with queues in front of the doors (i.e., people know where to queue, as opposed to just following the train until it stops).