This is a fantastic change, every battery powered device should have self serviceable replaceable parts if it is safe for an untrained individual to do so.
Hopefully this doesn’t just manifest itself as simply not selling these devices in the EU. Seems highly unlikely that would be the case, but a possibility I suppose.
I have a 2012 asus s46c laptop. Replacing its battery is as easy as sliding a nitendo switch joycon into/out of the console. Other laptops from around that time have similarly easy to remove batteries. There's no lack of know-how and I doubt making it easily replaceable is "more expensive" during production. Any company that solders or glues them must do it out of pure spite against the customers.
Really like the initiative by the EU to try and empower consumers again. I think generally the Switch and Steam Deck feature replaceable parts, but device manufacturers need to be held to a consumer-friendly standard.