I think a solo trip is a good time to add a few ounces back in with an audio book or long playlist or an actual book (no Tolstoy; this IS still BPL). Maybe not necessary if you are already used to the trail or are hiking big miles like on a thru hike, but at least for the first night of a trip.
For me, one occasional downside to going solo is feeling a little bored or lonely (having trouble deciding on the right word here) if I stop too early. Often the solitude is just what the doctor ordered, especially with a great view or interesting campsite, but it can have you spinning your mental wheels, too. Last year, I was on an overnighter in Mt. Rainier NP and the campsite I choose (based solely on distance from the TH) was in a deep forested valley. There wasn't anybody else there, it started raining and there wasn't anything to do or see once camp was set up and I explored the immediate surroundings. Having a little comfort or distraction is nice, even at the expense of weight or phone battery life. A little shot of whiskey would have gone a long way that night, too, but alas, I had none.
Don't forget to leave an itinerary (trails, vehicle info, where you are parking, etc) with someone.
Go for it, have fun and test out the shorts/wind pants/tights combo for the JMT!