It is a legitimate question, whether working on side projects is okay. Personally, my opinion is very strong on this matter, as I do not support wage slavery (being paid an hourly wage to be completely "rented") and therefore I support project/contract compensation when possible. That said, with a project salary it does not matter what your sequence of work is as long as the project is completed. However, with an hourly jojo I think it makes sense that we, as human beings, are going to need to do things that are not mono-task. Otherwise, we will go crazy and miss out on the beauty that is life. Instead, employers need to compensate people far better, and this as a culture can only happen when we share wealth more generously with those who need it. As far as I am concerned, the mental well-being, financial well-being, and health (vision, dental, etc) well-being is what an employer is responsible to help optimize in the life of a human. We provide one another benefit, may we maximize it. If zoning out to work on something tangentially related helps my mind uncontract and be able to view the patterns from a more inclusive and zoomed-out level, with the precision of all them tiny cities on those silicon chips, I totally say go for it. You are a human, not a robot, if you want a robot go hire one. If you want a human being, let them zone out for hours at a time, it is absolutely okay, because in the long run they will be fresher, stronger, more alert, and more tuned-in to what's going on.