Given that the yellow vest protests have been going on for two and a half years now, I would not hold up France as a model for income equality. The U.S. may be a decade in advance of most countries in this respect, but there's no indication I can find that France has the problem solved with its approach.
> there's no indication I can find that France has the problem solved with its approach
They certainly haven’t. However, the yellow vests movement fizzled out a long time ago. And union-bashing certainly isn’t the way to go if you care about equality, however imperfect they are.
Unions in France also are kinda racist; those shut out of the union system, that is menial workers, don't have a path into the same protections that unionised workers have.