I wouldn't mind being pulled out of stealth so much if the effect of Shadowy Disguise actually lasted the full duration regardless.
As it stands, Shadowy Disguise provides a guaranteed crit, as well as activates the CC aspect of Veiled Strike.
If invisibility breaks before casting Veiled Strike, neither the crit nor the CC occur.
The combo has a base cost of 700 Magicka, and even at that price stealth may break unexpectedly, leaving the second skill veritably useless.