I know what a DAC is. My emphasis with that last bit was on the “broad trend” part. You must be missing that point entirely to not see how old analog audio jacks “help” – the connector is the point.
… rant incoming, I guess.
There was this underappreciated thing with headphone jacks. For a normal consumer, all devices producing or consuming audio could be relied on to be compatible with all other devices producing or consuming audio, without any special adapters. It lasted that way for a long time.
I could plug my GameBoy, phone, radio, iPad, CD player, Kindle, laptop, camera into my headphones, or my dad’s headphones from a couple decades ago, or my stereo, or my car. Laptop into TV, or into speakers next to the TV. No matter which device, there was going to be a low-effort, reliable way to make the sound go in and come out, because everything agreed on this one very basic analog signal and connector as a mutually supported interface that was built into everything. It was too simple to be screwed up by bad implementations, didn’t need batteries, didn’t require pairing, couldn’t be locked down by companies like Sony or Apple, didn’t cause interference with your mouse. Your good headphones had a 0% chance of being unusable to listen to a particular device.
To make it even more magical, by tech product standards, this connector was ancient. You could practically feed a Victrola into the speakers in your hover board. That’s what’s getting casually discarded so Apple can more easily sell AirPods.
There will not always be options to connect audio, especially over time. A lot of modern headphones only support Bluetooth, while the batteries last and while the standards are compatible. A lot of devices don’t produce Bluetooth, and pairing is always annoying and sometimes unreliable. HomePods are great for listening to Apple-approved audio, but there’s no Bluetooth in and no line in. I had a third-party Alexa cylinder, and you couldn’t set up the Bluetooth without connecting it to your Amazon account, as I remember. Apple Bluetooth and Android Bluetooth don’t use the same codecs.
Just so nobody loses track: I’m not saying Framework’s design makes a significant difference. I think the difference between 5 ports and 6 ports is more significant. But it is one more small step towards eradicating the utility of the oldest, best, and most ubiquitous tech standard that will exist in my lifetime.