For what I'm concerned this is water down the bridge. The many years of excessive roaming fees have conditioned me to either switch of data altogether - relying on wifi instead - or use a local SIM when going abroad. As this still is a lot more affordable and I still fail to see the grounds for any extra fees when using a network owned by the same company which happens to lie on the other side of an arbitrary border I don't see any reason to change my habits.