That depends on whether you consider 10x as to be a context-based quality or person-based quality, and IMHO the later is the thing normally discussed. A python

That depends on whether you consider 10x as to be a context-based quality or person-based quality, and IMHO the later is the thing normally discussed. A python dev might be 10x in python, but they'll drop to 0.1x when doing JS for e.g. the first month. Does that make them a 0.1x dev? I'd argue not.