Nerf Abilities Instead of Health
I am pretty sure if you make low profile take 10% more damage, you would still see 20 wattsons and 20 wraiths in every high level lobby and pro scene. Making certain characters less or more appealing by making them take less/more damage is the wrong way to go about nerfs and buffs. The game needs to stop making jacks of all trades, and make more specific abilities instead.
- The shield regeneration ability can be its own character. Remove that ability from Wattson's ultimate and you will see her pick rate significantly drop.
- The beacon scan ability also can be an ultimate for a different character.
Reducing the number of things that each character can do will not just change the meta and refresh the game, but also force teams to adopt more specific play style. It will bid a strategy against strategy instead of seeing the same one done 20 times in the same game.
Disclaimer: I am not that good at this game, and my opinion is based on watching better players play not my own games.