Too often, people are given sick notes by their doctors even though they could manage some sort of work.
There are two reasons for this. Doctors are busy people and a quick unequivocal note represents the course of least resistance. Equally, doctors are restricted by patient confidentiality in terms of the information on patients' health they can provide to an employer.
The upshot is an unnecessary cost to the economy in lost working hours.
Changes to how medical certificates are issued are, therefore, sensible.