I agree with the sentiment but is there even any phone that doesn't run Android (or derivatives) or iOS and that can install modern "apps"?
This will ensure there never is.
You must realize, age verification is for more then just Googles Android apps.
Such a strong new legal framework must consider consumer hardware actually in use:
- Android variations Like GrapheneOS, Huawei's HarmonyOS, older phones running custom ROMs - Linux phones, which are sold in the EU and by EU companies
- Desktop operating systems
All of them can run Web Apps, and thus need age verification
My PinePhone runs postmarketOS and can technically run every modern Linux desktop "app".
Android derivatives are not considered enough, because they will not be Google-attested, so the app will refuse them.
Why does it have to be a phone? Some people still use tablets, laptops and, believe it or not, desktop PCs.