My guess is that the French SIM companies put all kind of artificial limitations on esim so they could keep their marketshare and continue earning money on licensing and patents
Don't forget this one for example: https://theintercept.com/2015/02/19/great-sim-heist/
I don't think the french abuse their SIM-powerposition, otherwise they would not force states like Palestine into using weaker encryption and such.
If you ever worked in telecom, you know for the fact that the SIM companies have sabotaged and vetoed every attempt to get a sane eSIM or SIM-free standard.
And nothing against the French :) , it just happens that the two largest and most agreesive companies in this area have French connections (Thales and Gemalto)
Care to link me to any credible/juicy article where I can actually read on this?