a lot of what i've listed is my opinion as to how it should be. But the mechanics i've listed aren't social mores and traditions and this is what i'm saying. If we were talking about a spell duration or casting time or a combat action there would be no "well i think it should work this way but it doesnt really matter- expect table variation" We see talking as something which shouldn't be as set in stone.
Core rulebook 94 "action" using diplomacy to influence a creatures atttitude takes 1 minute of coninuous intersaction. Making a request of a creature takes 1 or mour rounds of interaction etc.etc.
Thats not wishy washy. Thats as concrete and as absolute as knowing that it takes a move action to draw a weapon (without quick draw)
So why the scenario variation?
When asking a specific person specific questions eg. a venture captain who gives you text blocks if you ask him the right question. This is not gathering info. This is making a request =1 round (or more)
You can't just roll and request "the information" you have to know what your asking, you have to show that your engaged. Thats why you cant just roll. Eg. If you have to ask about the wherabouts of the noblemans daughter to get the info about the noblemans daughter. Then thats why its in the scenario as something to look for. Once again thats not gathering information.
Now if this person starts off indifferent and u just ask about the daughter your DC roll is higher than if you had. Introduced yourselves, talked about how horrible it is that his daughter is missing and told him not to worry because now you are here to make it all better. That'd take about a minute and now he might be helpful. But you can just ask him straight off.
There is a single 1 correct way that the mechanics work. It is clearly written in Core rulebook.
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But all that aside the aspect of how much a GM should "make" their players roleplay and whether they should be in 1st or 3rd person isn't fixed.
As someone who's not good at it i:
1-admire those who are and want to learn to be good at it
2-want to have the oppertunity to get better without being made to feel like i am letting everyone down.
So yes in that sense its about mildly challenging the comfort zone, without telling them to play a martial class or pushing them so they burst into tears at the table.
For players if you see someone struggling don't "show them how its done" because theres nothing worse than having the 5cha barbarian start taking the lead because he doesn't think much of your roleplaying. DO offer them pointers afterwards or even during.