Strains with a lot of sativa in them are never going to be particularly dense, regardless of the amount of light you give them. IDK which Moby Dick you grew, but some of the strains which carry that name have a lot of Haze genetics in them. And if it's an autoflowering variety, it'll also have a lot of ruderalis genetics. So it just won't be as dense as, say, a 100% Afghani indica, lol.
Most of the strains that I have grown through the years have been at least a little airy. I'll gladly accept that for a soaring sativa high, lol; even when I'm consuming for medicinal purposes, I don't want my bud to pour me into the couch. Even that isn't as bad as swallowing a bunch of opiates (or slapping on a patch every day), of course - but it's a lot closer to it than I wish be.
I'll also put up with 10 to 16 (and, in the past, up to 20+) week flowering times for the same reason.
As for "looks," lol... As someone commented recently, it all gets ground up in order to use anyway. I consider the effect, the taste, the aroma, the duration of effect, and if I still haven't decided by that point, I'll look at a strain's potency. All of that before even thinking about how the buds will look. Even back in the '80s, we figured it all looked the same wrapped up in a paper
.
Besides, airy buds are far less likely to mold. And it's a lot easier to spot the occasional male flower (and caterpillar, lol).
Different strokes for different folks, I guess....