idk if this should be in feedback or bugs, i think its not intentional (otherwise there wouldnt be much challenge or nuance from not having hud).
when i hold tab to see everyones build and mission info, the health is also visible. this is a cheaty way to find out how much health i have. and i hope its not intented to remain like this.
how this could be fixed is to simply remove the healthbar from that menu, or make the health bar private while in the no hud event.