Do you have any idea how much more unbalanced it would be if air stomp was made a regular suit ability? I use air stomp all the time and I love it. I'm proficient enough to know when to use it, and when not to.
Removing it as a perk allows me to use something else in conjunction, namely suit transfer, which I have at level 3. So, say I leap off the top story in Parking Deck, down to the middle of the street. Normally, i'd jump while cloaked, and if I didn't hit armor before I landed, i'd lose all my energy. If I did hit armor, i'd definately get noticed while recovering.
Lets look at it the other way now, as if it weren't a perk. I leap off the Parking Deck in cloak, turn someone 50-60m below me into mere paste. Full energy instantly. Cloak. Enemies spin around wondering what just happened, unable to see me due to being cloaked while i'm standing up, thanks to having full energy. I'd love for it to happen and all, because it would be godly. But.. it's just not balanced.
If anything, the stomp definately needs a buff of some sort, or the detection needs to be slightly tweaked. It would be nice to add something into the suit, where it could calculate your height, and inform the player with a % chance of a kill. Perhaps by looking down at an enemy from an elevated position, and a percentage number appears on the side of the screen somewhere, to aid players newer to Air Stomp. After a while, you'd remember how and when to use it.
Of course, if you played pro mode, you wouldn't see it. Thats my two cents.