This is a real issue. In principle, we can often install whatever, but it takes years in the Linux world before one can assume that any given tool or feature i

This is a real issue. In principle, we can often install whatever, but it takes years in the Linux world before one can assume that any given tool or feature is ubiquitous. And even then, things can fall apart. Python2 made it, but now it's going away. (Yes, there is a Python3 often present, but neither is a substitute for the other.)