Riding a horse on the Frances is a logistical challenge for anybody.
You need backup -- someone willing to drive a horse box or carry farrier tools and feed, etc.
You need to drive the route ahead of time and find and book places to stable and feed and/or graze the horse. (We have a donkey stable, and talk now and then to people who are looking for a place to put several horses. It´s a tough search.) You have to know where to find a farrier and/or vet if something goes wrong.
You need plenty of money.
I think this is why so many riders go in groups.
One thing distinguishes riders from hikers, and it´s their ability to fork out for both themselves and their four-legged friends. They move faster than the hikers, slower than the bikers, and do not often mix with people who are not also riders.
I rode a section of the Via de la Plata several years ago and loved it, but I went with an outfitter who took care of everything. It was a lot more of a pleasure trip than a Camino to me. That´s not to say riders do not make a legitimate camino -- zillions of riders have done it, and have benefitted tremendously whilst viewing the architecture along the way. Those old fabulous buildings were designed to be viewed from up high, on horseback, where the important people were!
It just seems like such a hassle, riding the Frances, esp. if you do it when the path is choked with hikers. But if I had an opportunity I´d certainly grab it!
Reb.