[ajnin]

I agree with all your interpretations except for #4, I think it's the opposite, if something is ambiguous then you need to add detail to clarify it, and you can present a lot of information at once as long as the representation is consistent.

Having lots of detail is not equivalent to being complex.

[da_chicken]

I would agree. I think the real rule #4 is "Take greater care when presenting detailed or complex information. The presentation will often speak louder than the information."

[yoz-y]

For this one I dig into the linked articles because I think that the “law” itself is not exactly actionable. As a matter of fact it actually concentrated on logo design. The way I interpreted it for interface design is that if you need to present a lot of detail, you need to give it appropriate space. For example if you have a graph with many curves on it, people will be able to see the general trend but they will not be able to make out individual differences.