This is a big nerf to tanks, Brigitte, and Mercy. Mercy for less obvious reasons. Mercy has the lowest hps of the main healers. She was already the worst main healer at healing tanks, now she is worse thanks to less damage reduction from armor.
Completely unnecessary. Armor only has a chance of staying that long if teammates have a lot of protection or shield health. Since shield generator was removed, only a small number of heroes have shield health. Symmetra did not need an indirect nerf.
Defense matrix will be much weaker after this. I expect a large decrease in D.VA’s pick rate.
Get ready for yet another meta people hate and want gone.