Doing a quick search, there's spots where paved roads are 30 miles apart, and lots of times it will be more than 10 miles to get to the nearest town.
Like 20+
Last I heard, there were still a lot of trail angel homes and on-trail campsites, but my info is ~25 years old.
For the Camino, I started out 40 pounds overweight, I did zero physical training in preparation, I had to plan basically nothing except my flight, arrival day and departure day. I was able to do it with literally only a few weeks notice (I had never heard of it until a month prior.)
Ultimately what I'm saying is the Camino trails are much more accessible to a wide range of people, as long as they're able to fly to Europe.
ETA: I should perhaps explain that the Camino trails, or at least the most popular trail I took (the Francis) is really more of a walking trail than a hiking trail. It's mostly flat(ish) and is much closer to what's depicted in pictures posted on The Great American Rail-Trail.
ETA: I shouldn't say it's vastly superior, rather the Camino is a very, very different experience from the trails alluded to here, and is superior in relation to that experience.
If it's not for you, that's totally OK. It IS something for many other people.
Lots you can think about on the trail.
https://en.wikipedia.org/wiki/Camino_de_Santiago#/media/File...