YU placed 50% of its musmachim in mixed seating pulpits and HTC/Skokie placed as many as 90% in such pulpits, according to research done by Professor Jonathan Sarna.
Mechitza doesn’t even have any firm textual requirements, and people will make a big hullabaloo over this, while not batting an eyelash while many carry in string eruvin that also violate the Gemara and Rambam’s understanding of carrying.
(Rambam and the Shulchan Aruch mention nothing about mechitza).