This is what I have to teach people working with numbers. Often with a risk of looking like a fool to the SWE crowd. That working with numbers is a craft in it

This is what I have to teach people working with numbers. Often with a risk of looking like a fool to the SWE crowd. That working with numbers is a craft in itself. And the primary driver for the craft are the numbers. Not SWE practices. You can't "feel" the numbers just by coming up with a huge testsuite. And pretty often, the feel goes missing when you translate your prototype notebook into "real code".