It makes sense in that having a local single player and a multiplayer mode requires writing much of the game twice. Having a remote single player mode only requires making the game once, with a special instance spun up for each single player game.
I live a life where I often don't have a persistent connection. That means for me, I can't play new games. While I have been a fan and player of Diablo since the first one I'll have to sit this one out.
Looks like a poorly made cable. Thank goodness the cable is detachable. You should contact moondrop and have them send you another one. For the price this shouldn't happen without something specific.