Since when is the jack outdated? Since Apple removed it? The jack is a worldwide accepted connector.
I would say it's not so much outdated, as it is redundant. There's really no reason for modern consumer devices to have a single function port taking up space on a mobile device, which is starved for space. So in that sense it is outdated.
My beef is not so much about removing the jack, but removing it without a a complete solution to replace it.
IMO, the adapter was a much better thing to include in the box than a pair of Lightning EarPods which literally can't be used with any other device, including Apple's own Mac.