Is it good design practice to visually link each entity when using Chen's notation?
Database Design – Do All Entities in Chen Notation Have to Be Diagrammatically Linked
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Best Answer
Yes, Chen though so and explicitly calls for it his 1976, and 2002 papers. From his 1976 paper, The Entity-Relationship Model-Toward a Unified View of Data.
From his paper, Entity-Relationship Modeling: Historical Events, Future Trends, and Lessons Learned 2002
Here is Figure 2,
His contemporaries that cite him also seem to be using explicit links Hartmann, Sven. "Reasoning about participation constraints and Chen's constraints". Proceedings of the 14th Australasian database conference-Volume 17. Australian Computer Society, Inc., 2003.
Without the links, you have no relationship. It's a dangling entity.