Another thing is the real meat of
Sacrifice as a story is the fallout between Diana and the others. Max himself is, frankly, incidental. You could swap him out for pretty much anyone and nothing would change so long as they can control Superman.
So it's real frustrating that we have to pretend Max Lord is a Wonder Woman villain now when there's nothing to explore. Even though
Sacrifice might not be in continuity anymore (or maybe it is, who knows?), any time Max shows his face in her neck of the woods, it's always based on this moment. But Diana killing him was completely impersonal. Her getting dragged into the whole thing was impersonal to Max, too.
No one cares about him periodically coming back to go, "Remember when you KILLED me, Diana?! Ooga-booga!"
If anything, Max should be haunting Superman or Batman. Clark had his mind and autonomy violated, and his good friend took the brunt of it. Like I said, he did at least feel a little bad about how he treated Diana. His anger and unresolved guilt is something that could be explored.
"Remember when I made you my attack dog, Superman? And then Wonder Woman sacrificed her reputation to protect yours?"
And, again, the whole thing really was Bruce's fault.
"Remember when Wonder Woman's life was destroyed because of you, Batman? How many Amazons died because of your paranoia?"
But in order for that to have any meaning, they would have to acknowledge that Clark and Bruce mistreated Diana or that they should feel any sort of guilt for the whole thing. And, as others have pointed out, DC's position on it is more or less that Diana was indeed wrong and needs to pay eternal penance for making a difficult decision in a situation Batman put her in.
So, we're stuck with Max...sometimes over rogues more deserving of time and attention. And we have to pretend this is some great rivalry based on a terrible, bad-bad mistake Diana did that she should feel sorry for.
Meanwhile...well, if
Tower of Babel didn't do it, surely the Brother Eye debacle taught Bruce a lesson about conjuring plans and A.I. programs designed to torture and humiliate his closest allies. Right?
...or not.