Well… for iPhones (and other smartphones) I’m not sure if anything changes. There is a exception in the regulation: if the device is waterproof, it is enough if the manufacturer or repair shops can change the battery for you. They do not need to be user replaceable.
But probably for MacBooks, there will be replaceable batteries in the future. I don’t see, how Apple will find a way around this regulation.
Apple Watch: they are waterproof —> nothing changes.
AirPods: well… are they waterproof? I don’t see user changeable batteries ever. Perhaps they will become waterproof in the future too? :) AirPods, now also for swimming and diving!
iPads: well: probably there will be changeable batteries in the future. Or we will have underwater Tablets soon. We just need another input method. Probably gestures like the VisionPro?