I think there is a line between gaining some one attention and causing them discomfort.

When I ride or drive by "that guy" dressed in all black with a strobe aimed at my eyes, it causes discomfort and a bad feeling towards a bike rider. I don't want to be associated with that behavior by the local 70mph on the way to git'er done, back road F350 Nascar contingent.

A strong strobe can also make it almost impossible to look at the rider, which seems counter productive. I do use the strobe on my headlight or headlights, when I think its necessary to be more visible.