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Subway system in Seoul also has glass partition between the platform and the tracks.

This offers 2 distinct improvements for passengers.

1. noise/dust mitigation: One can sweep the platform floors all you want, but dust from the track will always get to the platform. By installing the glass partitions, general atmosphere of the platform is just more pleasant.

2. less space for AC to cool: It's impossible to cool ALL of the space of a subway system, from miles of tracks to the platform. By installing the glass partitions between tracks and platforms, AC at the subway stations only has to cool the platform.

I heard NYC subway engineers say they can't install the glass partitions because the subways are not capable of stopping at a particular spot. This is required for the glass partitions to be installed.