I... don't agree.

Context is noticeably awkward when you get it wrong, and I'd say the article appears to have identified this as a problem and presents it as "this is a problem therefore it must be fixed". But, most of the time, there is not that awkwardness: context is extremely helpful to learners - of any subject.

It also appears that you are describing how to learn to read in an alphabetic system - so it's not immediately obvious that what you have said could apply to "most people in the world".