If I’m hiking and depending on energy to power my lights and phone, I’m just bringing extra batteries. I’m not going to mess around with portable solar, since it’s not reliable. For less weight and bulk, I can bring more batteries than I’ll need.
If I was on a month-long trek in the wilderness, that would be different. I might need solar then. Of course, with my outdoor skills, I’d be dead within a week. So, a few days worth of batteries would be sufficient.