Aye, basically if the ink is not watered, you are pretty much just painting the model with watery black paint, so it will cover everything you put it on.
When watered down, it will do the same, but it will be more pronounced in the detail areas, as it will pool there

You can test this out with a white primed model, and trying different mixtures of ink/water on each part, to see what kind of mixture you like.
Washes do not cover like inks do, and pool better in detail, but they are not as strong and do not give the shine of ink.