Yeah, its absolutely not a space problem. The Samsung S10e has a headphone jack, a SD card slot, and has a 5.8" display. Its way smaller than the vast majority of phones today, yet it has all of these features.
I think we all know the reason apple removed it was because they can sell you the worse product for more.
Thanks for sharing, just tried it out. It seems really well made, especially since its the first version. It even has a built in PDF viewer. Not bad. I might actually replace Material Files with it, which is what I was using until now.