I think there is a valid point that while this is changing what is happening under the hood, the behaviour is effectively identical for the vast majority of users, and arguably improved for most use cases (most non-technical users wouldn't understand that that switch would stop airdrop working, and even as an extremely technical user I have accidentally forgotten to switch my WiFi back on after needing to temporarily disconnect, and have ended up using a fair bit of 4G data. Luckily I have a lot of included data on my plan, but for some they might have to pay extra).
You can still switch off the radios if you want in settings.
You can still switch off the radios if you want in settings.