I think 90% chance of apple going for the EU-Specific model just like they did for Digital markets act, 10 chance of screws, 0% chance of actually popping the back cover off with bare hands.
For Samsung, 50% chance EU-Specific models 40% chance screws, 10% chance back cover tool-less removal. (Edit: typo)
As for other smaller manufacturers, probably just 50%/50% either screws or tool-less back cover removal.
Not sure about that…
I mean, its technically do-able:
See: Samsung Galaxy XCover 6 Pro - Removable battery, headphone jack, IP68 rating, “Military Grade” (MIL-STD-810H compliant), expandable storage (sd card slot), 1080p 6.6-inch LCD display, Gorilla Glass victis+, USB 3.2 25W charging, fingerprint sensor. The whole package.
Only downside is the shitty cameras and slow processor.
You seal everything but the battery in one watertight compartment. The battery is a sealed, self-contained package, in a second compartment. Dunk the phone, the only thing that gets wet are the battery contacts, which are protected the same way that earbuds with magnetic chargers are protected: if the contacts get wet, the battery shuts itself off until it has been dried off.