Lanefan
Victoria Rules
That's a risk someone with secrets has to take, that those secrets might be acted on in ways unintended because they are secrets and others are acting in ignorance. Seems fairly realistic to me.To address the one point that is less opinion, if someone is acting mysteriously, other players are rather incentivized to figure out what's going on. Secrets, at best, hold a decent chance of bringing complications and problems to the party, even if they are not so far as to be actively at cross purposes. If you are worried about party success and health, you shouldn't ignore them. However, because the other players lack any context for which possible direction it is going, they stand a terribly good chance of interacting with it in ways that are actively detrimental to the desired outcome and/or the enjoyment of the player.
For example, if one of the PCs is actually a spy for the opposing faction then there's no way the other players should know that. In character they might get hints and clues that something is amiss if the spy character doesn't keep good cover, and out-of-character they might see the spy's player passing notes to the DM now and then (but we all do that anyway, a lot of the time), but that's it.
The idea of a "desired outcome" is IMO flawed from the start, particularly when different desired outcomes are in direct conflict. This is where the phrase "play to find out what happens" holds water, because as play develops there's no way of knowing who - if anyone - will get their desired outcome or anythng even close.
I've found it can last for ages sometimes, until the other players learn about it at which point there's no intrigue any more.Intrigue will for the most part only last as long as the other players leave it alone, which is far more likely if they are aware OOC of what the general arc of it is.
You're also assuming the intrigue has an arc, which it doesn't always. One in-character secret I've seen done numerous times (and have done myself) is a character coming in as one class when in fact it is another, or has a second, hidden class. I once played a Druid-Thief as a Ranger and nobody ever caught on, even when I did things a Ranger in theory couldn't do.
Another one I've done as DM - long story as to why - is bring in a player's character as an NPC while the player brought in an NPC as if it was hers. That one was fun, went on for a year or so; and the reveal sure caused some jaws to drop around the table.






