It really shouldn’t take that long to fix considering most tanks either got health changes or an extra ability.
First, axe the tank, DPS, AND support passive. Cut health values back to what they were months ago. Reduce hitbox sizes again.
For the tanks…
For Rein, remove the extra firestrike. Remove cancel-able charge, buff damage to 300. Give him back his steadfast passive (Which is basically current tank passive.) Boom, done.
For Zarya, remove the extra charge for her barrier, make it so energy decays at 1.8 seconds rather than 2.0. Done.
Winston can literally stay as he is and it wouldn’t change anything.
D.VA: Reduce matrix length, increase cooldown. Buff boop damage on mech again. Done.
Mauga. Scrap armor, give him back the 25% increase firerate when firing both guns, increase spread. Buff overhealth conversion from 150 to 200. Done and done.
Wrecking Ball. Personally don’t think he needs any changes. Remove giving shields to teammates.
Junkerqueen. Make it so commanding shout only applies to herself.
Roadhog. Get rid of damage mitigation and ability to walk with take a breather. Increase health it provides. Buff damage on scrap gun, but also make it so hooked in targets are further away from him. Done.
Sigma. Scrap his barrier ability, give him a vortex ability that can “reflect” bullets like Ion from Titanfall 2, all in one big burst. Done.
Doomfist. I’ll be quite frank, I’m not sure how to change him…
Ramattra: Add slow back to his nemesis form; increase height and duration of vortex. Done and done.
Orisa. Honestly all she’d need is just cooldown increases. Otherwise, shes fine.
And for support…
Revert Zen completely before OW2; 5v5 screwed him over so hard.
Lucio is fine.
Anas nade should be 50% healing reduction rather than completely. Buff duration back to 4 seconds. Increase damage to 75. Done
Lifeweaver. Replace most health with barriers (Since he won’t be able to self heal due to support passive going away.) Done n done.
Kiriko. New passive: Gives her a self heal meter that works like old support passive depending on how much you’ve healed your team. Only kicks in when she hasn’t taken damage for more than a few seconds.
And thats just bare bones basic number changes. It honestly wouldn’t take them very long to change it back if they actually put in the time and effort. But, they’re most likely more focused on what slop to add to the shop than actually giving the game updates it needs.