This is due to the system abuse that we all saw in Season 1 - players of 70+ Skill rating partying up with 20-30 SR players to get easier games and win more often then not. This new feature will certainly limit that system abuse and the games will feel much more balanced.
HCM is the second most common form of cardiomyopathy. If you have HCM, it means that the walls of your heart are thicker than they should be. Some thickening is normal for healthy people who exercise or who play competitive sports. But with HCM, the thickening becomes extreme. In time, the thickening of the heart muscle can cause the heart to get bigger, or enlarge.
Broken heart syndrome is a temporary heart condition that's often brought on by stressful situations, such as the death of a loved one. People with broken heart syndrome may have sudden chest pain or think they're having a heart attack. In broken heart syndrome, there's a temporary disruption of your heart's normal pumping function, while the remainder of the heart functions normally or with even more forceful contractions. Broken heart syndrome may be caused by the heart's reaction to a surge of stress hormones.