Out of curiosity, do you consider Stallman to be a purist, in the sense you discuss? Because he's often regarded as a purist in the tech world. (Tim O'Reilly, the well-known book publisher, called him George Bernard Shaw's "unreasonable man", the sort of person upon whom all progress depends.)
So for example, Stallman says that you should become a waiter rather than write proprietary software, which he calls "evil". He unfailingly corrects you if you refer to the operating system as "Linux" (instead of "Gnu/Linux"), or "Opensource" when you're really referring to "Free Software." (The latter because Free Software is concerned with ethics and freedom, while Opensource is more about the practical matters which businesses are interested in.)
But it's not clear to me from your essay whether your consider him a "purist" or not, so maybe we're in agreement.
Tayssir