There are a few phones that still do a headphone jack and expandable storage but they definitely aren’t the big flagship brands if that’s what you are looking for.
Heck, Moondrop a predominantly audio gear manufacturer, just launched a phone specifically for audiophiles and it has a 3.5mm/4.4mm headphone jack combo. I don’t think its quite as modern in the other aspects but hey, it has the unicorn features we don’t see nearly as often!
Personally the attraction here with the boox is the e-ink screen. I also use my phone for reading pretty much everything but e-ink would be easier to look at for longer sessions.