In a walk between urban centers across the developed nation of Spain, it is not realistic to expect remote walking. Private land restricts most of the options. The easy and direct routes were oxcart paths that were later paved. Vehicles connect the towns and cities. Where busy roads can be avoided, the designated route has done an excellent job of marking the safest route. In most cases it will not be very far from a busy road. Dirt turns to mud in the rain, so some sections have been improved to
senda. Some sections have been made wheelchair friendly. It is completely impossible to cross a city without using pavement.
It is pointless to be frustrated that the Camino is not the Appalachian Trail (which crosses thousands of roads, by the way). Spain loves the pilgrim money, but I don't think that pilgrims can expect Spain to disrupt its daily activities just for pilgrims.
If the question is about path surface so suitable footwear can be purchased, good question. If it is about the path not being remote enough, well it is a question about something that cannot be changed.
It is what it is.