Which will make them pointless for me - don't bother at all. I want zero cockpit clutter or HUD stuff in the way when I'm trying to look at lovely views / line up a screenshot / etc. Forget the "immersion" in this case, make it a useful tool that yes, breaks the holy grail of "immersion". And just don't use it if you don't like it! Add in all the limitations suggested and there is no way it will imbalance things.
What's the problem with compromise to give everyone what they want? Nothing would change to detriment the game for you... you could ignore the feature entirely.
It is not up to me, but up to FD, and they have said no at this point.