I know this is a popular opinion and I might or might not be in the minority here, but I don't miss the headphone jack on my phone at all, and every gram of battery or other functionality that has taken its place is worth it for me. Water proofing one connector (USB-C) is probably also easier than two.
For the increasingly unlikely case in which I really do need wired headphones, I just carry them with an adapter permanently plugged into them.
> a miniscule onboard amplifier
That amplifier would be dead weight for me! (To be fair, it would be in good company with all the power amplifiers for 5G bands not available in my country, but I get the point of unifying SKUs globally and I can hardly plug one of these in with an adapter when traveling.)
For the increasingly unlikely case in which I really do need wired headphones, I just carry them with an adapter permanently plugged into them.
> a miniscule onboard amplifier
That amplifier would be dead weight for me! (To be fair, it would be in good company with all the power amplifiers for 5G bands not available in my country, but I get the point of unifying SKUs globally and I can hardly plug one of these in with an adapter when traveling.)