One common annoyance in Warframes is the game's handeling of going out of bounds.
Often it's not an issue, as the map does a good job of keeping you in the play area, but in some maps the cutoff can be surprising, and you can simply walk somewhere and find your screen fading to black, and you teleported back a bit.
With Operators void-jumping, it has become much easier to get accidentally out of bounds, to the point that it has become a common occurrence.
In Duviri's undercroft, I have often encountered the problem of fading to black when my operator is not at all out of bounds, rather the warframe I left behind was in the middle of a jump, and fell down to oblivion. Since the map has lots of holes and gaps, and switching to operator does funny things to warframe momentum, this behavior can happen unexpectedly, and very much breaks emersion in the game.
I think it would improve the game a great deal if these out of bound problems were dealt with more gently:
1) An operator trying to void teleport out of bounds, would just teleport to the edge instead of teleporting to a forbidden zone and being removed from it.
2) Extend some maps, letting you to a bit deeper into those open areas on jupiter labs etc, where there's no good reason for these areas to be considered out of bounds.
3) No need to teleport the operator if the warframe gets out of bounds.