I was replying to a post that made an assertion about how D&D has been for the past 50 years.
In addition, these current Stealth rules seem to be broadly modelled on the revised 4e rules, so my post seems relevant for that reason also. Here are the 4e rules for remaining hidden (ie after a successful check has been made; from PHB2 p 222):
Remaining Hidden: You remain hidden as long as you meet these requirements.
Keep Out of Sight: If you no longer have any cover or concealment against an enemy, you don’t remain hidden from that enemy. You don’t need superior cover, total concealment, or to stay outside line of sight, but you do need some degree of cover or concealment to remain hidden. You can’t use another creature as cover to remain hidden.
Keep Quiet: If you speak louder than a whisper or otherwise draw attention to yourself, you don’t remain hidden from any enemy that can hear you.
Keep Still: If you move more than 2 squares during an action, you must make a new Stealth check with a –5 penalty. If you run, the penalty is –10. If any enemy’s passive Perception check beats your check result, you don’t remain hidden from that enemy.
Don’t Attack: If you attack, you don’t remain hidden.
Not Remaining Hidden: If you take an action that causes you not to remain hidden, you retain the benefits of being hidden until you resolve the action. You can’t become hidden again as part of that same action.
The "keep out of sight" rule in 4e occupies more-or-less the same functional space as the "enemy finds you" rule cited in the OP.
You're the one who referred to 50 years of D&D history, not me!
And given that the new rules seems to be rather similar to the 4e rules, I think it might matter.