IMO the best would be cubicles with a roof and door behind you, i.e. fully sealable for sound proofing and isolation when you need to concentrate, but you can o

IMO the best would be cubicles with a roof and door behind you, i.e. fully sealable for sound proofing and isolation when you need to concentrate, but you can open the door when you need to collaborate. No idea why nobody does this. Japan has been offering these kind of sealed workspaces in manga cafes and "private video watching booths" for decades.