I remember people saying the exact same thing when Apple removed Floppys, serial ports & optical drives
False equivalency. All the items you listed were blatantly obsolete when Apple removed them. Us old folks remember Microsoft shipping a box with 60 or 70 floppies to install Office from. Serial ports suck and aren't extendable. And so on.
There's no "replacement" for analog audio going into your ears. As this thread should make it abundantly clear, an external converter of some sort is absolutely required when there's no analog output from the iPhone.