Libraries are part of a larger "research ecosystem", so they can exclude all the loud and talkative bits of research because there are other places it can live like the hallways and cafeterias and text messages people use. Open offices are undifferentiated. There's nowhere to segregate disruptive activities to because there's nowhere else to go, except for maybe some small concessions to meeting rooms. That space can't even be a good space for everyone because it's constantly serving a hundred mutually conflicting uses rather than providing specialized purpose the way a reading room does.
