[krelian]

>The learning curve is finally low enough that it is practical. I think it is fair to say that C++17 is the first version where that is true.

What are the specific C++17 features that make this a reality?

[coliveira]

Just look at the new features in C++17 that simplify the use of templates, like variadic templates, constexpr everywhere, automatic type detection working together with templates, etc. The last versions of C++ are mostly about making using templates easy, which allows programmers to operate at a different level than languages such as Go and Python.