Any iPhone could replace its metal housing with an equally strong polymer and become exponentially more difficult to break.

1/5th pound burger is going to sell better than the quarter pounder while using less beef.

Here in the USA our analogy would be Marlboro cigarettes. It would be much easier to make counterfeit loose Marlboro cigarettes than to make a counterfeit sealed box of Marlboros. Buying a bunch of loose Marlboros from a stranger isn't something most Americans would do while buying a sealed pack of Marlboros anywhere from anyone is something most smokers would do as there's very little risk. People recognize branding and packaging and can tell if any detail is off even just slightly. It's incredibly rare for counterfeiters to get every packaging detail right to the point that it will pass visual/physical inspection.

America lags behind the modern world in our pharmaceutical tech. Here's an example of a blister pack that uses a wide range of different doses in an easy to use package that would help patients taper down gradually to avoid pitfalls. In the USA this would require multiple prescriptions and typically just wouldn't be done. https://link.springer.com/article/10.1007/s11606-022-07862-1