Again, being unlicensed there is no compulsion on anyone learning how to read a chart. But as part of my training I've been taught basic aerodynamics, meteorology as well as air law and how to understand charts.
Because we only fly at about 30kn airspeed we don't tend to go that far. My local airfield Membury is in class G until FL65 where it goes to class A. The clouds I flew to were nicely spaced so that I had great vis at all times. My max height was 2500ft QFE (set to Membury which is 667ft above sea level). So I was well below the terrors of lass A airspace.
I agree that there are huge benefits to the sport being unlicensed, cost of entry being just one. But if I screw up I'm basically a bloke wearing a 28kg backpack going at 30mph. The potential for damage is much, much less than a light aircraft (yes I do have a reserve chute).
I guess it's a bit like letting kids on the roads on bikes. I need a license to drive a car, but my 12 y.o. can ride a bike on the same roads.
I know of people who have flown into power lines, flown low over crowded beaches and been complete idiots in other ways, but they are in a very small minority. The CAA seem happy at the moment to let things continue as they are at the moment realising that most of us really appreciate the privileged position we are in..
The fact that I can put some kit in the boot of a family car and drive somewhere and fly is just amazing.