I think concern is placed on the wrong end, at least in terms of criticality.
I am less concerned about "maximums" right now. I know that's going to set off all kinds of alarm bells right now, but bear with me.
The two are intertwined for sure, but I'm mostly concerned with "minimums". If we had a society with Universal Basic Income, housing and Healthcare for everyone, and people had a safety net to pursue their passions, then I'm far less concerned about if someone has a billion dollars.
Again, they are both part of the same problem, but it's the focus. If billionaires were no longer allowed, and the money was re distributed amount people with 9 figure net worth already, it doesn't solve anything.
So yeah if people have the mobility to move from jobs, housing and Healthcare taken care of, and their basic needs met, I think it solves a lot of labor exploitation right away.
From there we can continue the debate, but I'm more concerned about taking care of everyone who is closer to the floor then worrying about the ceiling. I think there are capitalist ways that continue to reward actual breakthroughs and risks rather than the exploitation we have now.