But the implementation matters, and almost all of these bills internationally are being done in bad faith by coordinated big-money groups against technologically illiterate and reactionary populist governments.
(if we really want to get into an argument, there's what the UK calls "Gillick competence": the ability of children to seek medical treatment without the knowledge and against the will of their parents)
I would personally favour allowing parents to buy drinks for children below the current limits (18 without a meal, 16 for wine, beer and cider with a meal).
The alternative to this is empowering parents by regulating SIM cards (child safe cards already exist) and allowing parents to control internet connectivity either through the ISP or at the router - far better than regulating general purpose devices. The devices come with sensible defaults that parents can change.
Maybe a majority of people today agree with that, but I know I don't and I never hear that assumption debated directly.
The idea of the "nanny state" has been debated a lot, and this seems like a very literal example of that. But once some status quo is firmly entrenched, debate about it tends to die down because the majority of people no longer care enough about it.
TBH many parents done exactly that by giving phones/tablet already to kids in strollers