I'm with GP on this one. I am also on a phone without 3.5 mm jack and have wireless headphones because of that. It sucks. With wired (3.5) headphones thing just worked. With wireless, I have to think about headphones' battery level. I can charge from an independent source, but that is a problem when I'm moving (but yes, powerbank would work). I can also use wired headphones through USB-C, but this is a problem in a different setting - the phone better be full or I won't be able to charge it at the same time because the port is used.
I'm sure there are valid technical reasons for removing the 3.5 jack, and I have adapted my headphones to the new situation, but man do I hate it.