I completely agree with you, this is often very ineffective. Moreover, sometimes there are many departments and even a sales department that constantly need to make calls or other negotiations. In general, there seem to be solutions for this too. I recently read about office pod - https://hushoffice.com/en-us/private-pods-what-does-privacy-actually-feel-like-in-an-office-pod/
Although for open-type offices, each person needs to create a capsule.