All of you saying Darius doesn't need a heal
If he didn't have a form of sustain/tankiness, he would be pre rework Darius all over again, in where he dies too soon to be able to get his damage off and is basically a low CC meat shield.
Now that he is able to survive and get his damage off, everybody hates him and wants his heal gone with the compensation being "higher Q damage!"
Listen for 5 seconds, if you gave Darius 1 million damage but he couldn't survive a teamfight for 2 seconds like pre rework because he had no way to survive outside items and base stats, he might as well have 20 damage as he can't get it off.
Is the heal a little strong? Probably, maybe needs a little toning down again(try 10% on each champion again if it is still strong)
Is his damage strong? Hell no, he deserves his damage if you allow him to get 5 stacks on you and don't peel him off in team fights.
Any duelist like
will rek him so hard. Any long duration fighter like
will get rekt from darius
are some easy covers.
are far better than Darius.

are the best counters to Darius, even in the early game.
. Dude's got like, no counterplay. The only one who keep up with his sustain is
, and he's in a rather shitty spot for a while now.