Been replaying DQIV on the 3DS. I can't see myself playing a 3-D game on a small Iphone and portrait only now. Though I heard here or somewhere that the DQ games on mobile haven'f sold alot or should I say what SE expects of rhe series.
It's true that there is little need to play the DS titles again if you have them on the DS. The Mobile port of DQ4 does add Party Chat which is a nice addition that was missing from the DS version. As for portrait mode, I know it's a contentious issue, but the DS-remakes are perfect for portrait mode since the DS games are already in a form of portrait mode, just with a hinge in between the upper and lower screens. It's nice to see the games in one continuous image without that little gap of missing stuff where the hinge appears.