I thought we agreed about common usage of words and ideas here. The common use of rolling a die is not behind obstructions so only you see the roll.
No it isn't. The common use of rolling a die, is rolling a die with most other conditionals or situationals left undefined.
Nothing indicates that the dice should be hidden.
One more time, and here we are back at the crux at where I think there is contention. Nothing indicates anything one way or the other*. In the absence of defining information, your assumptions are as valid as, but no more supported, than any others. It is figuratively up in the air.
*We'll get to combat inspiration later
In Monopoly, one does not hide the dice when they roll. In Yahtzee one does not hide the dice when they roll.
If there was a positive benefit to doing so, one probably would. In games such as poker, one definitely hides one's cards. Perhaps more directly, in Monopoly, one rarely reveals how much money they have if possible, as it influences how one's opponent plays.
The rules of these games don't say the dice are not hidden, and everyone understands that. So why would it be different for this? I understand that many people like the idea, and that the game can be made to work with secret rolls, but if looked at objectively there isn't a reason to do it by the rules, and all the previously mentioned abilities suffer from it greatly.
If you look objectively at the rules, there is plenty of reason not to reveal a dice roll. First reason that comes to mind: so that the DM does not have to reveal a monster's AC or to-hit, and let the Players suss it out with the information that they know. As to many people liking the idea, I'm not sure that that is the case. I'm pretty sure most players play roll in the open, and DMs are somewhere in the 50% vicinity on where they fall. You simply called out
ThePolarBear's position as a house rule, and we are disagreeing with that assertion.
Also, for people who disagree , I notice that the parts of my posts bringing up the direct rules that show that the player can see the roll ( Combat Inspiration makes the direct note of it ) are always ignored.
I have to mea culpa. I thought I had, and clearly didn't. I see that I was addressing bardic inspiration (since I'm working off of 5e srd), not combat inspiration. I'll have to go check that out when I get in front of the books.
So while people say " There is nothing saying either way " I have shown that there is, while others have not. It doesn't say Combat Inspiration is the only reason the player sees the roll, it says that they see the roll and THEN can decide if Combat Inspiration will be used.
Others have not what? What were others tasked with doing?
As to combat inspiration. It is certainly indicative of open rolls. Given how often the gamebook talks with competing voices, I'm going to hold my opinion, though. I'm going to see if anyone else has found this little gem, and any other passages which might have contradictory implications.
EDIT:
Page 235 of the DMG makes it pretty clear it's an individual decision for the group... there is no standard, though having players roll out in the open is suggested and the pros and cons of whether the DM rolls out in the open or not are discussed.
Ah, I knew something would come up quickly to muddy the water.
Regardless, even if there is wording which supports your position (and I'm sure we'll all go round and round on what that means), that doesn't change what the rest of us see as a serious failure in facultative reasoning. If your position is so unchallengeable, what's all the references to monopoly and yahtzee? Why say " if looked at objectively there isn't a reason to do it by the rules" (which directly contradicts "And there isn't anything wrong with keeping rolls secret except that it very much handicaps abilities that revolve around modifying AC or attack rolls" since that highlights an objective difference)? Do you not recognize that literally none of these are coherent arguments towards your position?
Ignoring Combat Inspiration and DMG p. 235, do you understand the argument that others are making? That in the absence of the ruleset addressing something, it doesn't default to the way that seems most obvious to you, but instead that all possible options are equally supported? Are we even successfully communicating this position?