Although this is true, there are hints on the phone that kinda say they were gonna implement it but never did. First is the fact that you can enable a rudimentary portrait mode. Second is certain theme images such as LockSliderThumbPortrait.png located in most themes at /usr/share/themes/themename/images. Why would this be included if there's currently nor has there ever been a portrait lockscreen.

Don't matter to me, I hate phones that are primarily portrait. You don't watch your television with a longer-than-wide resolution, your laptop's resolution isn't 900x1600, I don't know, just always hated a portrait-oriented screen.