“Learn More” links are a problem
nngroup.com
nngroup.com
If there is not much more content to actually be seen in the article, it works in favour of those producing quick and easy content to hit metrics as they won't be over promising.
I always go with something like _Download the annual report (380KB PDF)_ rather than the client-suggested _Click here_ to download the annual report. But I think a combination was proven to be effective.
(I realize that it's probably less so when you start talking about accessibility, but I don't know much about that. :/)
Does this make the blog's information more manageable, or is it also crappy design?
I personally dislike it very strongly. Reminds me of feeds without the full article, and means to generate clicks.
I doubt that it is there for a usability reason. The browser window effectively hides content in a standard and predictable way. Additional content hiding rarely improves usability.
If the destination page doesn't jive with the previous context, then that's a problem with the two pieces of content and the very notion of linking them, not the link text itself.
It's probably also worth mentioning 3D Touch and how it can help the problem.