> Headphone jacks are not necessarily considered a premium feature by all phone users.
Neither is a large screen, indeed I consider large portable electronics to be decidedly non-premium.
A premium feature is something I'm willing to spend money on - a phone the physical dimentions of a traditional SE, with a 3.5mm jack, dual sim cards, a modern processor, and a decent amount of storage.
Others may have other views on what premium is.
Headphone jacks are not necessarily considered a premium feature by all phone users.
They are by some, as is evident, but that view cannot be taken for granted — even here at HN.