I think Ada is seen as some esteemed language that only the military and space would have the expertise to use. I had that opinion for maybe a decade but it was very wrong. The other issue was that it is so powerful that compilers had bugs and by the time an affordable open source compiler came along I guess C++ was gaining libraries and the militaries don't release libraries.

The ironic thing is that Ada was designed to be cost effective over a projects lifetime. C costs you a lot further down the line.