That's a latency issue, and there's no real fix for that. The parent commenter, I believe, is talking about the problem where people use speakers and active no

That's a latency issue, and there's no real fix for that. The parent commenter, I believe, is talking about the problem where people use speakers and active noise cancellation, which makes it impractical to speak and be heard at the same time; the noise cancellation will ruin the speaker-user's mic audio while it has to cancel out another speaker. Headphones, worn by all parties, resolves this issue.