Agreed, we need HC mode in AOW, not only Portal. This was my go to mode in BF3 and I would like it also here, especially with vehicles now being nerfed so much.
Problem with Portal 'Milsim' servers with no HUD is that you also lose 1st person HUD in vehicles, so no reticles at all. I think in BF3 it was part of the vehicle screen, kinda like red dot being part of sight, now it is made from game HUD elements so it disappears. So option to disable HUD for infantry only would be nice addition to Portal.