Am using a Zenfone 8 with a jack. As for future upgrade, still unsure. My top priority would be the size - has to be the same or preferably smaller than the Zenfone, so that limits my potential options.
I was travelling recently and was fortunate to be able to watch a F1 race. The track had a FM broadcast of the commentary in English, and my Zenfone 8 with the built in FM tuner made itself very useful indeed, since the FM tuner only works with wired earphones.
We need a Command & Conquer Remastered style treatment.