Diameters might appear in drawings.
But they NEVER appear in physics. (The distance between particles determines forces. Diameters are a boring parameter about the size of something.)
Machine tool programming is mostly radii in the paths, and diameters in the setup parameters.
By the way Glassdoor is subject to subversion by a company's HR. Go to Theranos' Glassdoor postings and ask yourself whether the glowing reports sound like they were written by employees, and further, whether it is reasonable that they coexist with some of the rotten ones.