I'm still waiting for icon defensive switching. Offense got it with icon passing, so why not give it to defense? As a software engineer, I think it's safe to assume that the logic is almost exactly the same. It's just a matter of: when holding down R2 without the puck, the same icon overlay that you get when carrying the puck appears. Then, selecting an icon will switch you to that player. Obviously, this wouldn't apply in player-locked modes.
It's so simple that there must be some other motive or reason why the devs refuse to add this mechanic. Do they think playing defense will be too effective? I don't get it.