Yep, although theorems and proofs are, of course, central to mathematics, pictures are absolutely essential for developing intuition and for introducing concept

Yep, although theorems and proofs are, of course, central to mathematics, pictures are absolutely essential for developing intuition and for introducing concepts. In the case of complex analysis, pictures are critical for explaining the contour integrals for example. The pictures do not mislead, they elucidate. That said, there's nothing wrong with the OP article. It is an introductory piece and folks seeing this stuff for the first time do well with a variety of approaches to the topic-- this one happens to not use pictures. That's OK.