I won't buy a phone that doesn't have it. I hate to charge my wireless earbuds, also they break after a few years for no reason because the battery got old. So I have a physical aux headset, will last me 10 years easy and never needs charging.
BUT the other day someone suggested to just get an usb-c to aux adapter and I'll probably do that in future if the aux connector isn't present on the next phone.
I'll get a steam deck as soon as I can detache the controller and put it on my TV like the Switch. While the Deck is probably amazing, it's what I need to get one, additional to the gaming PC. I always feel chained in, when my controller is made from one part only.