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.
I still have a Samsung Galaxy S2, which has such a cover. From the beginning, the phone would lose its back cover (and the battery would fall out) whenever it hit the ground, even just from a table. I solved it with getting a thin plastic phone case, and even after 14 years the phone works just fine.