Huh? How did your claim about the comparison of running a session to a lesson-plan like outline suddenly turn into a licence to make fun of me for my "privilege"?That is fair - you have never had a time limit on an RPG. OK.
You have been in a privileged situation of:
"Hey, Jenn is moving next month. She is being deployed, and she wants closure on the campaign?"
or
"Hey, Jim really wants to run Daggerheart next, so he needs to know when your campaign will end so he can start prepping by buying minis, writing the campaign, printing maps, etc."
or
"Hey, Jean needs to start bringing her kids to the game or leave. Do you think you can add them? We know it will change the entire nature of the adultness of the campaign, but they will only be here six months?"
No one minds if you are in a privileged gaming spot. In fact, most people will applaud it (including me - lucky you). But there are tables out there that do have time limits and restrictions.
If you're trying to resolve a campaign before someone moves away, or whatever, sure, maybe that's different. Is that every session that you GM, though? You certainly didn't say or imply that in your post!
I also don't accept the implication that because I'm not working to a session outline, my game is running slowly. Based on my recent experience of comparing my Mythic Bastionland first session to someone else in a Mythic Bastionland campaign, I have the impression that my group gets through quite a bit of content in a given session. It's just not pre-planned content!
Do they? I mean, maybe most tables are something like Let's do this Adventure Path in 6 months of weekly sessions. In that case, advice on "play to find out" doesn't have much relevance to them. What they need are a suite of good railroading techniques. I think both Justin Alexander and Eero Tuovinen have posted some useful blogs about that.Most tables DO have time limits upon them, be it imposed through social constraints, work constraints, or family constraints. Therefore, to me, it is exactly like a lesson plan: Sometimes you need to get through this material by such-and-such a date in order to make the players happy.

