I’m not sure your side of the conversation is being had in good faith at this point.
I can’t speak for the French. You’d have to ask them. I know there have been integration issues there. The very fast swing towards the hard right is one sign to me that integration has failed badly though. We had no such swing to the right in last month’s elections here thankfully though there is a definite increase in the number of vocal hard right lunatics here unfortunately.
I think a fair question is - are some cultures less open to integrating when they move to a new country? Another fair question is - are the people in the country where folks are immigrating to less open to integrating with the new arrivals?
If the answer to either is “yes” then the societal cost of that lack of integration (or ways to mitigate it) has to be looked at lest we end up in a very undesirable situation that we are rapidly moving towards.