I think the main two reasons are: - Ada is in practice managed by AdaCore; compiler features may or may not migrate back to the free GNAT compiler. I understand

I think the main two reasons are: - Ada is in practice managed by AdaCore; compiler features may or may not migrate back to the free GNAT compiler. I understand that they are kind of stuck: they have their customer base, and any kind of opening up would cause revenue losses that may or may not be recovered by more customers. I think they are making the right choice - superficial as the reason may be, the syntax turns many people off (it's kind of an acquired taste for me)