Yep. The visualization tricks in this article are for building understanding of basic ideas in probability theory and information theory.
In most real situations, they wouldn't be very practical. As you note, the core trick in this essay only works for 2 or 3 variables, assumes they're discrete, and doesn't scale to the variables having lots of values or really improbable values.
There are visualization techniques which are useful in the real world, at least some of the time -- a lot of my blog explores this in the context of neural networks -- but that wasn't my goal in this article.
In most real situations, they wouldn't be very practical. As you note, the core trick in this essay only works for 2 or 3 variables, assumes they're discrete, and doesn't scale to the variables having lots of values or really improbable values.
There are visualization techniques which are useful in the real world, at least some of the time -- a lot of my blog explores this in the context of neural networks -- but that wasn't my goal in this article.