Well, if you're in a particle physics Ph.D program and halfway through you decide that instead of doing particle physics you want to be a software engineer and

Well, if you're in a particle physics Ph.D program and halfway through you decide that instead of doing particle physics you want to be a software engineer and build a clone of Mathematica Notebooks.... obviously the system is not going to support you all the way. I'm a big fan of Jupyter and am thankful to Perez for all the work he did for all scientific fields. But you shouldn't expect to get a particle physics Ph.D for it.