In my opinion, frankly the second blog is so convoluted and inundated with a overly verbose explanation of the unnecessary complexity of vests, that I just gave up reading it about halfway through. Sorry but IMO it is really bad. That is not the way to simplify explanations. I don't intend to offend you, and I just want to be honest with my reply. I am not downvoting you. No animosity is intended. We are trying to help each other and the community understand.
In my opinion, the first blog is better organized and has more concision making it easier to follow, yet still you introduce this afaics mathematically unnecessary complication of vests. Afaics, the understanding of vests is a programming issue on the backend and it is mathematically irrelevant w.r.t. to understanding the economic structure of Steem, which is why I never mention it as it will only make the explanation of the economic structure of the Steem system more obtuse.
Afaics, there appears to be a mathematical equivalence between my way of conceptualizing (and the UI's way of presenting) SP as units of restricted STEEM coupled with the STEEM being separate units of the money supply where the supply of STEEM is increased ~100% yearly, versus your explanation of SP as vests converted to STEEM units by a ratio which changes as supply of vests increases. Frankly I've never found yet a complete explanation of the way vests are accounted and programmed on the backend, which is another reason I don't discuss them. And I haven't studied the code to figure it out. And I didn't find your explanation of them to be complete and unambiguous. If you'd like to cite a more canonical resource on vests, I'd appreciate that.