The AT is often called the "green tunnel" for a reason. Take sunscreen and sunglasses on an AT thru-hike if you feel it essential. I don't though because an AT thru-hike is largely a forested somewhat shady long distance hike. PCT different story, IMHO.
I preface Maxpatch, "I think the OP is going to find out that the same item may be essential to one person, a "nice to have" to another, and unnecessary weight to another."