I agree 100% that allocating our time is important and prioritizing certain tasks above others is much needed for the progression of ourselves, but... some of the activities that you have noted as time wasting could be argued otherwise.

For instance, listening to music. I could say that listening to music before/during certain tasks could improve time and efficiency, which ultimately improves your time management (and makes it more fun!).
As well, walking the streets or going for walks could also improve your sense of being and could declutter your thoughts or let you be more mindful of where you are. This could allow you to come back to tasks with a better mindset and would again, improve your efficiency and time!

Like I stated at the start of my comment, I totally agree with time management, it's just important to note that we are not machines and we need to make sure our brains are getting the respite they need and also that they are experiencing the emotions that make us feel alive, and not just part of the machine.

Very informative article though buddy, I enjoyed reading it!