Assassination moves and slow/no moving not showing on the motion tracker, sure. But I don't consider that stealth. But invisibility-like stealth? Maybe as a halo-style power up but NOT as a class ability. Take a look at WoW rogues for how badly that can go. Either it becomes too weak to and doesn't matter (at which point, why add it?), or it becomes extremely strong to the point of being near OP (if not OP). For those that haven't played WoW, the rogue class has stealth. They can't be seen unless you practically run through them while stealth is activated. The ability has come to define the class and they have easily become the most despised class by others. But it also means that they're pretty weak when caught outside of stealth...so they were given ways to help them get back into stealth. Regardless of if the class was OP or not, the ability came to define them and imo is horrible for PvP balance. As such I would NOT want to see such a thing happen in Destiny. And given how HP works in this game, going invis (even as an ability) just has too much potential for balance problems.