clearstream
(He, Him)
I like a man who says what he means

Skills in 4th edition are too broad to be defined so narrowly. They are NOT 1 tool that can only be applied only one way in one situation.
Stealth can be used to:
duck behind cover in battle - resulting in a lasting condition
open a door quietly - only applies during the action
melt into the crowd at a market - applies during the action and results in a lasting condition
Whisper instructions unheard during negotiations with the Bishop - only applies during the action
Draw a dagger quietly after having successfully made a stealthy move action on a guard - an skill check to maintain a condition.
By RAW, Stealth can't be used to result in a lasting condition. There is no such wording. As for whether skills need to have broad applicability, I agree with you.
The problem is that for the mechanics to resolve robustly, with good consideration to use and balance issues, it is essential to pick one way or the other. Picking one way or the other resolves intent cleanly and allows us to move on to rules that are easy to agree with and simple to run.
But if we insist on picking and choosing actions to apply stealth with, and the mode of application, not only do we have no guidance from RAW, but we are increasing the mechanical complexity without increasing the play value commensurately.
-vk