@Cynthia:
1. I was in the sun essentially all day on PCT / Little Round Valley route except where there were trees. The north facing slopes of the peak are too far away to provide any shade in early June when the sun is only 15 degrees from overhead at noon. Also from looking at Google Earth it seems like the tree line elevation is about the same on both routes, but someone can correct me if my interpretation of the satellite images is wrong. Anyway during summer I don't see how one can make the case that the shade is substantially different for the two routes.
2. There was very little wind on the day I did the hike (even on the summit it was almost dead calm), so the supposedly cooler airflow doesn't apply on the day I was there. I can't comment about a typical day since I've only been there once.
3. I'm 90% sure there at least as much elevation gain going the PCT route because even though one starts at about 1000' higher elevation, there is A LOT of downhill that one must regain, particularly due to all the criss-crossing on Fuller Ridge. I didn't measure the total downhill but I think it must be at least 1000', maybe as much as 2000'.
4. Neither route is a technical climb, and the elevations are nearly the same, so the comparison to K2 isn't valid. For a given elevation gain I can gain elevation faster on a steeper trail than one that covers 2 to 3 times the distance via switchbacks. (After all, why do people going uphill cut switchbacks if not to save time?) (And no I didn't cut any switchbacks, as much as I was tempted ... we all know that's no bueno.)
5. When one starts a blog in ALL CAPS saying that a trail is closed when in fact it isn't, yes some people would term that "alarmist." In hindsight of course I realize you were being facetious/sarcastic about the trail being closed, but I until I read the fine print a couple of times I did think it was true.
@Zé: That's not the way I hike. I don't hike at the same PACE regardless of how steep the trail is. I hike at a nearly constant EFFORT which I have gauged is one I can maintain for many hours. I speed up in flat sections and slow down in steep sections to maintain a constant effort. I have found through long experience that that's how I can most reliably attain my hiking goal for that day. And effort increases with both grade and distance - neither comes for free.
Good, safe hiking to everyone!
