Meanwhile, I was taught and practiced IPv6 in 2003-5 in engineering school (France).
As of 2024, IPv6 deployment in France was >97% mobile and >98% residential due to not being required for obtaining a 5G radio license (and then v6 simply carried downward to being available on 4G) + every ISP that provides FTTH also providing v6.
https://www.arcep.fr/fileadmin/reprise/observatoire/ipv6/Arc...
Over here IPv6 JustWorks to the point of absolute boredom.
Is it commonly used within small/medium/large businesses?
I was taught IPv6 in the mid 2000s too, in Italy.
But penetration there is just about 15% or so :/