How do cozy nooks and unassigned workstations implement EH&S? We know sofas and couches lead to poor posture which results in muscle and skeletal discomfort am

How do cozy nooks and unassigned workstations implement EH&S? We know sofas and couches lead to poor posture which results in muscle and skeletal discomfort among other things... But nooks and even unassigned workstations may not be ideal in terms of ergonomics...