For me it’s the notification light you used to find on older phones, was particularly good to know if your phone was charged without picking it up
Dacs are great, I have one for my IEMs and love it. But only when im sitting. As soon as any movement happens I am occasionally punished when the cable moves 1mm out of its port with noise or complete sound stoppage. I can use my TWS but sound quality and reliability suffers.
3.5/4.4 jacks are a beautiful thing.