I never really played Baldurs Gate I think. I once tried, but it did not work on my Laptop at the time properly, because it was to old and not optimized enough or something like that, so I stopped.

But anyway in Baldurs Gate it is class speciality, not everyone can do it and its compensates the otherwise low damage output of those rogue classes?

Anyway we must wary to not mix stuff up. Sneaking is hiding and not stealth. In D:OS stealth more about not getting attacked, but sneaking did quite the same making stealth kind of pointless. Even with a cost of 4 AP you probably can misuse it to solo fights. Glass-cannon, Lonewolf, all those give me some AP skills, deal tons of burst damage, go into sneaking, wait until all cooldowns are down, deal again ton of burst damage and go back into hiding, rince and repeat.