It’s relevant in terms of there being a skilled developer pool to hire from. There are exceptions, but the vast majority of software technologies that have been success have done so by being accessible to hobbiests to install locally, even if that’s not their primary use case.
The good news about professional programmers is that they're capable of learning. Ada is not a hard language to learn, if you have some familiarity with procedural programming (which 99.99% of programmers do). Considering the amount of time spent on safety-critical systems, there's enough time to train up a new hire that only knows one language on Ada, assuming they're actually a competent programmer.
