Agree to that last post.
On the visible roll but secret DCs, that breaks down somewhat when the roll is extremely bad or good, and/or the players have a fair idea that the DC for that task should be.
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Actually, extremely high or low roll and fair idea of what the DC "should be" are the cases the viewed roll but hidden DC shines at and is intended for.
Rogue sits in tavern.
looks around. Assesses "most of the open area and room latches are simple, cheap, shaddoy at best. Locks on the innkeep's door are better, typical for them to spend to protect their stuff. odds are lockbox would be tougher and hidden in the room."
just assessed easy, medium/moderate and hard cases - EXPECTED cases.
Character gets to a latch and gets a bad roll " well, i blew that when the pick snapped." and thinks the failure is due to his obvious fumbling.
Character gets to a latch and "gets a good roll" then in character "yep, that went fine and..." if that "latch" does no unhook the character **should** have the opportunity to go "wait a minute. that should have worked."
A high or low result does not need to be and IMO detracts from the scene if it is ruled "some mystery beyond our ken" as opposed to "how well you performed."
A singer sings a song in a tavern. Uses perform to keep their attention or sway the mood.
low roll - she hits off key several times, flubs the words of the song, a cat screeches the beginning of a mating call from the window ledge outside just as she begins the mid riff... likely as not the crowd reacts a bit during the performance... but she knows this was not her best work (but not whether or not it succeeded per se)
Now if this succeeds because of low DC - maybe it became funny and/or painful enough it was a distraction after all or the crowd loves her perseverance through the ordeal and will respect her afterwards for "gutting through it."
High roll - On the other hand, rhythms go right, tone is great, plays off the crowd well, and even uses the cat as something to be worked into the act turning crisis into opportunity - sees she did a good job... may or may not succeed but feels good with the effort.
Just like say a GM may choose to narrate the attack roll of 2 (fail) as "you miss the mark by a mile" versus narrating the result of an attack roll of 16 (fail) as it glances off the armor, coming close to finding purchase" or "at the last second, they were shifted by a needed parry against the barbarian and your arrow just barely missed" instead of "you missed and your character should not know why".
a GM can certainly elect to move all rolls to mysteries or some types to mysteries and so on...
me, i really prefer a consistent view of "your roll is how well you think and your character thinks their effort was..." whether it applies to an attack, a save, a theft or a song. I prefer letting a rogue "figure out" this lock was tougher than usual and i should change my approach to this problem" from a "rolled 19 and failed" just like a warrior can when his bow shot of "19" misses and the same for the low rolls.
"It should have worked but did not work" or "well that was not going to work at all" should be a clue not forbidden fruit that is viewed as "poisoning" the well of decisions - borrowing some people's framing.
IMO of course.
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