The boxes-and-lines is a very common way of visualizing tables and relations or types and subtypes and/or components. Also in most other so called low-code platforms. That is why it was under consideration: familiarity. I agree it is not very useful though.

Projectional editors can of course show the model as text and in other formats as well, like boxes-and-lines. You wouldn't be able to permanently place them in any specific spot then, so moving them around would at most be supported during a viewing session.