I guess the temptation would be to say that it is in fact a hard problem. But then I look at something like HOCON which basically solves all the problems with Y

I guess the temptation would be to say that it is in fact a hard problem. But then I look at something like HOCON which basically solves all the problems with YAML, you can understand it after about half an hour of reading, but somehow it's a fraction as popular as yaml or json. Maybe it just lacks marketing muscle or a really visible project.