I walked the Mozarabe branch from Malaga to Mérida within the past month. It is not at all like the
Camino Frances these days: very few people walk the Mozarabe and they generally do not leave their junk behind in the albergues
If you think you will need something then either bring it with you or buy it in one of the larger towns. Not a route where you can just assume that there will be other pilgrims around to help out or that there will be food, water, shelter or the rest of life's little luxuries every hour or two. Some long empty stages that need forethought. I carried a bivvy bag and self-inflating mat to give myself the option of breaking up some of the longer stages. In the end I only used the mat during a long overnight stopover at Madrid airport. Even so I liked having the option to sleep outdoors comfortably and would take the same gear again. The flexibility it gave me was worth the fairly small extra weight.