I created a Shortcut for that, essentially a button on my homescreen I can press which actually disables bluetooth and wifi. And when my phone is connected to wifi, mobile data gets disabled.

It's not perfect, but at least I don't have to open the settings app each time.

Turning Airplane Mode on and then tapping the Bluetooth icon will fully disable Bluetooth (gray background, not white). You can also just disable it in Settings. Apple’s argument, as I understand it, is that Bluetooth and WiFi don’t actually consume much battery, but non-technical users would habitually disable them to save battery and then complain that Location Services didn’t work well. Hiding the setting but keeping an essentially useless toggle prevented those non-technical users from making their device function worse while still letting them feel like they were saving battery life.