Call me a bit of a luddite, but the only specs I tend to look at these days are power handling (just to make sure the amp doesn't woefully over- or under-power them), impedance (amp compatibility), sensitivity (for a rough guide to 'loudness', and yes I admit this is possibly a red herring) and weight. Especially weight. I made the decision to have a go with the Nemesis 1x15s based mainly on back-friendliness!
Obviously there will be many folks who will eagerly want to know every single spec, almost right down to the designer's preferred socks. For this reason alone, maybe it's worth researching. But there will also be many of us for whom 'Vd' will really only ever be something we sniggered about in the playground when we were 12.