However, you already have to buy a passport (often for a lot of money) in most countries, so pragmatically, I don’t know that it’s a hugely different thing to ask. However, there’s a big difference for children, the elderly, and people with disabilities.
Immigration tends to stretch human rights though. It costs >10k gbp in visa fees for a British citizen to return to the UK with a non-UK spouse from arrival to settlement. You also need to be earning a fair bit of money, and not have the British partner as a stay at home spouse. I would say that frustrates article 8 ECHR, but the government disagrees.
There are countless examples of similar issues re international travel and immigration. Smartphone ownership is simply one of many.