· As a DM, what would you do in this situation to ensure that everyone is included? (I DM a couple of games and I want to avoid doing this myself)
· Given the risk of being excluded, should plans that involve taking players off screen for more than a minute or two be prohibited? If plans that take a player off screen for an extended period are allowed, how much effort should the DM take in fast forwarding through that time?
· As a player, how would you respond if your DM did this? Is confronting the DM appropriate? Although we did have a Session Zero where people expressed an interest in playing a more strategic game, most players quickly decided that it is impossible to have fun without hitting things.
· Is my indignation justified? At this point I am seriously considering quitting the game. I can understand and accept a plan failing if it has a fatal flaw or if the dice don't allow it. If there is a missing piece of information that causes it to fail that is fine too. But when a player makes a decent plan (was it a decent plan?) based on invested time researching, their class features specific to the situation, and knowledge of game world politics, is it reasonable to expect it to at the least take place at some time during the session instead of being shunted to the side?
All right, so here are my comments and replies to your questions.
First of all, I agree with the sentiment that you largely did this to yourself. You didn't tell the rest of the party what you were doing; you split the party (!); you actively avoided the encounter the DM threw your way. Jeez, dude, the fact that you sat out most of the game is pretty much on you- and, in my opinion, you could have avoided it very easily.
There's lots of good advice here (including that I shoulder a generous share of the blame). One thing in particular I would like to address is statements about my need to be 'The Hero' and not sharing the plan. It might just be our group, but generally when we come up with a plan we don't share the details with everyone else beyond what is absolutely necessary. We find that it makes it more interesting to learn of the plan as it unfolds because we tend not to expect it.
Here is a
huge part of the problem. If the other pcs knew what you were up to, they could have stalled the orcs ("give us until dawn to answer"). They would have, at the very least, had a sort of meta-reason to delay the battle and wait for you. But "See you guys later!"? As far as the other pcs (excepting the one guy you told, and that basically doesn't matter) are concerned, there's no reason to delay anything- let's get this over with.
And you're playing D&D. Combat runs in 6-second rounds. Objecting to the combat having run in 6-second rounds is... well, it's silly. Criticism of the 6-second round is fine as a systemic thing, but if that's the system in play, you should basically expect it to run in 6-second rounds. This is probably an example of where the 1e one minute melee round is superior (siege/army warfare), but hey, that's not the game you were playing. So on that score, although I agree that a 24-second siege is silly, unless the DM's already set up the expectation that it's going to work differently, you really should expect strikingly quick combats.
Anyway, I also agree with another common sentiment in this thread- the DM could have done you better by letting you play an npc or a backup pc or something. Hell, even some bad guys! That's my preference for offscreen pcs when possible. But that doesn't work for every DM or every player.
You asked if character-goes-off-alone stuff should be 'prohibited.' Well, that's very much a playstyle issue. For some groups, it probably is already. For my own, I run a pretty hardcore sandbox style game, so if a pc wanders off alone, so be it. But (as many others have said) that one pc will only get a fraction of the time everyone else gets- and my groups are pretty large, typically 6 to 8 players per session, so that means like an hour or less in the session. I do try to warn people before they wander off alone that they won't get to be spotlight hogs, but the choice is theirs.
Now, as to your reaction, playing a session where you don't get to do anything sucks. It's boring and not much fun. It does happen sometimes; maybe your plan went awry, maybe you got knocked out and nobody could bring you around, maybe you got killed early on and the pcs were in a trapped room with no way for you to show up until they escaped. Whatever- it's not fun, but it does happen; it's best when there's something for you to do, some way to participate, but that's not always possible. If it happens a lot, I'd probably leave a campaign, but if this is the only time (or if each time it's because of the choices the players are making), I would probably stick with it, assuming it was otherwise fun.
Okay, one final thing- confronting the DM. I'm gonna agree with others again here and say "discussing it with" probably works much better than "confronting" the DM. And clear, open, honest communication is important in any relationship.