I didn’t look into that since I was getting hung up on the more fundamental issue of the chat copy saying “here is a link to Amazon, the price is X” and then the link saying something very different.
The rest of the market largely followed suit though, despite the fact that at times Google tried to specifically market a 3.5mm jack as a feature. If the presence of a headphone jack was really critical, wouldn't some premium handset maker have capitalized on it?
My take is that I was cranky about it at first, but now that i've finally lost all of my legacy wired Apple earbuds I'm happy to have the 1-2% extra battery.