I won't claim to be any expert on gear, except just for myself. I was out on the JMT just a couple of days ago, and I chatted with lots of northbound hikers, so I learned lots of their problems.
One pair was northbound around Sapphire Lake in Evolution. They had run nearly out of food, and they could not make it to Reds Meadow ( ! ), so they wanted to zig out over Piute Pass to North Lake, resupply, and then return. Hmmm. They were looking to cross the Glacier Divide as a shortcut. Hmmm. I told them to go out over Lamarck Col if they didn't mind a little snow at 13,000 feet.
One pair was northbound at Colby Meadow. The guy looked like he had been out on the trail far too long, and his ladyfriend bore a striking resemblance to Danny DeVito as the Penquin. But, I digress. They were low on food and low on fuel, so they were eating very little. The bugs were thick, and their bug juice was out.
One backpacker was northbound and his stove fuel had all leaked, so he could not cook at all. Think about how to avoid that. There are many places where wood fires are not allowed, and there typically isn't any wood there anyway. Esbit makes a good backup.
Normally during a day, I wear a synthetic short-sleeve t-shirt with a very thin long-sleeve shirt over it for sun. Then in camp, I put on a heavy fleece shirt. At night, in the sleeping bag, if it gets cold, then I spread out my down inner jacket over my hips. Then, in the morning, I wear the (already warm) down inner jacket while I eat breakfast. By then, the down inner comes off, and the fleece comes off once I've been hiking for 15 minutes. The rain jacket is the last resort layer.
I have some 2.5-oz wind pants, and those are my extra layer over the regular trousers for weather or cold protection.
The MSR Pocket Rocket is an OK stove. I know, I have two. However, there are much lighter stoves out there. My Gnat weighs 1.65 oz, and it works fine. Your single fuel canister is going to last how long?
What are you going to do if the single 100-oz platypus gets a leak?
I use one 64-oz platypus for raw water, then a second one for filtered water (after a gravity filter). On my last trip, somehow one platypus got lost, but I still had the other for a secondary container. The primary is a 1-quart Gatorade bottle.
Do you really need a frying pan? If not, consider something as just a lid, like aluminum foil, reflectix, or thin titanium foil.
What happens if your lighter gets lost? A book of paper matches weighs about 0.2 oz.
You probably won't need to carry a phone along since there is hardly any cell phone service anyway. Nobody wants to hear from you anyway except for maybe your stock broker.