Grids, making up amny grids can lead to a more organized layout. Having many rows and columns could give you a wider layout, more nice black space that could surround your layout.
Hierarchy, ” keep it crunchy, don’t overdo your work”. I can understand wanting your work to standout and not knowing your overcrowding it. Sticking to a simple way isn’t always bad.
Type, ” be consistent with the structural significance” I do agree with having struture, keep it the same throughout. Having different sizes everywhere can be chaotic to look at.
Typographical overcrowding is almost as bad as a packed F train, for sure.