As people get older, they realize that you only have the "right" to write a blog on productivity if you've actually found a system that keeps you productive for years on end.
If you do find such a system, it's much more likely to be idiosyncratic, involve a complex set of barely conscious reflections and automatic associations which get you into a certain frame of mind, and also almost impossible to fully describe since you probably don't understand every element of it. Which makes it nearly impossible to write about.
By this I mean productivity becomes part of who you are, so that your "productivity system" becomes barely distinguishable from your personality. That is, to outsiders, you have a productive personality, or you are "just an innately productive person".
This alienates the productivity seeker, because not many people who are not productive currently can imagine becoming innately productive people. So in turn they seek help from people who are not "innately productive", and instead have recently developed some kind of conscious system to deal with productivity. Which is a fragile approach.
The blockage points seem to be identity trade-offs like "are you willing to become less open-minded and curious to become more productive?". Because often what is holding you back is an addiction to a certain frame of mind that is antithetical to completing a specific set of tasks each day. The blockage is that you're not actually willing to become an innately productive person.