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Not exactly what you are talking about, but slightly related: the company Fairphone makes phones with parts that can easily be replaced. The philosophy is that you will not have to buy a new phone every 3 years. They do have some customized options aswell (i.e. ram, storage, models) but its limited.
But going full on optimization with phones, laptops and tablets, similar as a desktop, is just incredibly hard due to the lack of space in the device for the components. As such it makes more sense to offer a wide variety of models, with some customizable options, and then have the user pick something.
Their answer is buying the usb-c to 3mm adapter. If you keep that connecter in you bag, ot connected to your headphones, you should be fine most of the time. Unless you would like to charge and listen to audio at the same time.
To me, that feels like a solid design choice, but yes we all have our dealbreakers.