If the requement for sneak attack would be only stealth, you would be right, but your second attack can be aimed at someone who was hit with Guiding bolt in previous round for example.
So a rogue with 2 weapons or under haste effect can find some real use for that control over sneak attack. And then it's quite irrelevent how is it on low leveles, we will go above them eventually.
Which is precisely what I addressed in the following lines.
I honestly don't care. I wouldn't find even the situational fringe cases you are describing meaningfully "game breaking", anyway.
If you use a haste potion chances are your extra attack wouldn't come from stealth anyway, and even if that was the case for a peculiar mix of factors I wouldn't really mind.
