What's already happened to open-plan offices is that they are at least half empty due to remote work. People go to them to interact with coworkers as much as for a quiet space. People go specifically to be available for face to face conversation, so loud conversations are heard.

Voice isn't my main input but the handful of times I voiced something in the middle of an office, I spoke quietly, with a near whisper, into a close mic. It was much quieter than I would normally be able to speak to a coworker.

tall, thick cubicle walls.