Agreed daaubrey, you’re nose is always visible and granted if you make the conscious choice to look at it you’ll see it, it’s always in you field of vision. but as daaubrey has pointed out your brain chooses to ignore it.
Think of it like breathing in and out, you’re not normally aware that it’s happening unless you start to think about it, not exactly the same thing but the best analogy I can think of at the moment.
Also I think it would be a tad annoying constantly looking at you nose while in game.
Head gear obstructing you’re vision would be different though and could make and interesting addition, affecting your choice of helmet type.