He's saying X isn't fun. DEFINITIVE. Skip it. DEFINITIVE.
So let's take him literally.
wyatt thinks basic gate guard scenes and supply shopping scenes are not fun and are a waste of time.
I hope we all can agree that Wyatt said that, and that it is probably his preference to not spend much time on those activities.
I agree with him.
I do not want to sit around while the GM makes each player role-play his shopping for supplies before we head out to the dungeon.
I do not want to sit around while the GM makes us answer the gate guard's questions when ultimately he will let us through and nothing else will have happened from it.
I do expect that anybody who agrees with Wyatt will also accept that SOME shopping scenes do need roleplaying out and SOME gate guard scenes do need to be roleplayed out.
Note, I am pretty sure Wyatt is talking about generic gate guard challenges, generic shopping trips, and generic travels to places that nothing of import happens. These are activities where the outcome is certain and spending time on them is where he advises skipping them.
I'm also pretty sure that Wyatt isn't saying the only fun encounters are combat. Traps are fun. Roleplaying meaningful discussions is fun. Chases are fun. Complex problems are fun.
Burning realtime for mundane activities where the outcome is certain and can be summed up is not fun for me. Not fun for Wyatt. Not fun for most people.
That last statement is what I take from Wyatt's intent. Seperate it from the specifics of "talking to gate guards".
If you are GMing for me, in a 4 hour block (because I work about 80 hours a week and thats about how much time I can spare and still have room for my family and chores), do YOU really think YOU can justify WASTING my time.
this isn't about me being a jerk and never being in your campaign. For each player, their time is as limited as mine is. As a GM, do you really have a RIGHT to waste my time? Do you think it would be COURTEOUS to respect my time? Isn't the GM's time just as valuable and worthy of respect?
Therefore, if time is FINITE, out of all the elements in the game, why would you prioritize mundane activities where the outcome is certain as something to spend TIME on as compared to the other encounters that have uncertain outcomes?
The term fun is just an expression of value. If you prioritize all the types of encounters in the game, you could expect differing lists from each player. But I should hope that "Spending time on Mundane Activities where the outcome is certain" is not on the top of anybody's list.
I suspect there is not an RPG in existence (please do not prove me wrong) about mundane people doing mundane things. Every one I've heard of is about PCs doing exceptional things like fighting, casting spells, solving big problems, sneaking and stealing, and talking important NPCs into doing what you want.
Not a one of them has as an emphasis, buying carrrots, delivering tomatoes to the market and getting a good price for them, or getting past the TSA checkpoint with correct ID and no contraband in your luggage. None of them detail the random 2 people you get seated next to on the airplane and have to talk to on your 3 hour flight.
Because RPGs are about the interesting stuff. Not the mundane stuff.
So minimize the time spent on mundane things where the outcome is certain.