Would you mind explaining, then, how the half rest, quarter rest, and eighth rest symbols indicate the temporal relationship they have with each other?

It’s pretty telling which symbols you chose. The relationship between half notes, quarter notes and eighth notes is obvious.

The rests are shaped similarly to their note counterparts. Eggs are bars; stems are sticks; flags are the same just facing different directions.

I confess I did choose the non-obvious symbols to illustrate the article's point that those symbols are non-obvious.

We agree that some of the symbols have clear visual relationships. The article suggests it would be nice if all of them had such relationships. Instead, we have what looks like a random agglomeration of symbols, of which a few happen to make sense.