Hey - thanks for the comment. The vision for Config.ly is slightly different than what I think you described. In my mind there's "ENV VAR" which are secrets and has things like Doppler or many of the other things mentioned here.
I view Config.ly as being useful for _anything you'd put in a class variable_. For example text copy or styling. And if you put it in Config.ly instead of hardcoding, you can avoid deploying which can be slow (e.g. for iOS it's days) -- and potentially even avoid having developers do the work altogether.
Does that make sense or do you view it differently?