You repeatedly caricature the opposition, and wonder why these threads get so contentious.
Maybe if you allowed for the possibility of something other than "a facade of control on the player's part," a productive discussion could occur, rather than a contest to see who can optimize their Sling Mud rolls.
Who, me, sarcastic about the exact same topic brought up the umpteenth time? I apologize that it came across as overly harsh but we're just not going to agree.
HIDDEN [CONDITION]
While you are Hidden, you experience the
following effects:
Concealed. You aren’t affected by any effect that
requires its target to be seen
Surprise. If you are Hidden when you roll
Initiative, you have Advantage on the roll.
Attacks Affected. Attack Rolls against you have
Disadvantage, and your Attack Rolls have
Advantage.
Ending the Condition. The Condition ends on
you immediately after any of the following
occurrences: you make a sound louder than a
whisper, an enemy finds you, you make an
Attack Roll, you cast a Spell with a verbal
component, or you aren’t Heavily Obscured or
behind any Cover.
HIDE [ACTION]
With the Hide Action, you try to conceal yourself.
To do so, you must make a DC 15 Dexterity
Check (Stealth) while you’re Heavily Obscured or
behind Three-Quarters Cover or Total Cover, and
you must be out of any visible enemy’s line of
sight; if you can see a creature, you can discern
whether it can see you.
On a successful check, you are Hidden. Make
note of your check’s total, which becomes the DC
for a creature to find you with a Wisdom Check
(Perception).
While you are Hidden, you experience the
following effects:
Concealed. You aren’t affected by any effect that
requires its target to be seen
Surprise. If you are Hidden when you roll
Initiative, you have Advantage on the roll.
Attacks Affected. Attack Rolls against you have
Disadvantage, and your Attack Rolls have
Advantage.
Ending the Condition. The Condition ends on
you immediately after any of the following
occurrences: you make a sound louder than a
whisper, an enemy finds you, you make an
Attack Roll, you cast a Spell with a verbal
component, or you aren’t Heavily Obscured or
behind any Cover.
HIDE [ACTION]
With the Hide Action, you try to conceal yourself.
To do so, you must make a DC 15 Dexterity
Check (Stealth) while you’re Heavily Obscured or
behind Three-Quarters Cover or Total Cover, and
you must be out of any visible enemy’s line of
sight; if you can see a creature, you can discern
whether it can see you.
On a successful check, you are Hidden. Make
note of your check’s total, which becomes the DC
for a creature to find you with a Wisdom Check
(Perception).
In any case I can summarize again. There are bad DMs. No amount of rules will make a bad DM any better. If a DM doesn't want anyone to hide ever there will simply be no options to hide. Meanwhile more rules frequently makes it more difficult for good DMs because it takes away their freedom to tell engaging stories.
While the wording is a bit confusing, my understanding is that you can take the hide action DC 15 Dex to become hidden which is now a condition. So what happens if one guard A could see you soon because they're walking your way but guard B doesn't have a chance to see you? Perhaps you can take guard A out or cast silence before they can raise the alarm. But with the new rules it doesn't matter because hidden is a condition: once guard A sees you, you lose the condition whether or not they have a chance to raise the alarm.
There will always be mother may I issue because the DM is the one establishing the environment. More rules have never improved bad DMs. Feel free to disagree.