I am not a great scholar on early camino literature, but I have read some. It is mostly written by clerics, and it focuses mostly on local conditions, what was done to meet liturgical needs, and often songs and musical settings for Masses. The early records are much more practical guides than the deeply internalized, emotional, "how deeply I have changed" camino writings we know in our time.
They were very different people then, writing very different documents.
Most of us are literate. Most of those pilgrims were not. Their remembrances died with them.
Most of us are much more individualistic than your typical medieval pilgrim. We spend a lot more time in our own heads, analyzing our thoughts and feelings. These guys were deeply integrated into their groups and communities, and their spirituality was likewise much more community based. What they felt and experienced individually was not so important -- although I am always moved at the descriptions of pilgrims falling to their knees and singing a tear-choked "Te Deum" when the spires of the cathedral are first seen from Monte de Gozo. The pilgrim hysteria and joy in the cathedral and the city are mentioned, but almost always in collective forms.
These guys were all about St. James, worship, and faith. They did not waste ink and parchment on their personal reflections.
The walk or ride home was not so important to them. Once you get to Santiago, the rest is just travel, not worth writing about unless robbers attacked -- or you died!