I returned from Italy and didn't see DCC a single time in Rome, Florence, and Pisa. I did do a lot of contactless payments, which might have helped prevent it. However, a few of the usual suspects for DCC (duty free, airport hotel, and restaurants in tourist areas) didn't result in any DCC. It was likely an option at both of my hotels in Rome and Florence, but I didn't see it since I had used an AmEx to pay.

Both the Harrods and F&M shops at LHR T5 are still doing DCC, and I saw multiple people opting in. At least at Harrods the cashiers were asking for currency preference. When I said pound sterling the cashier actually reached over the counter and in a nanosecond had pressed cancel to opt out of DCC.