As someone who is now a C-suite exec, I was aghast reading that discussion. If you're a CTO who doesn't code, so be it do what works for you, CTO is such a broad title that there are plenty of companies that don't need a CTO who codes. But the shock was at how adamant people were that CTOs have better things to do than contribute to software. Not only have I worked with excellent CTOs who all contributed source code to projects, many CTOs I admire and look up to do the same, such as John Carmack, Fabrice Bellard, Cal Henderson.

There are domains where a CTO absolutely need not code, and coding is not the end all be all of building a technology company by any means, but it's hard to imagine many situations where CTOs who do code are doing it at the expense of a more valuable skill, and furthermore I can think of many companies that would benefit from having CTOs who did actually contribute source code.