Originally posted by inkista ...the falloff pattern of the light is actually smoother than the AD200's bare bulb head...
I'm not arguing that a diffusion disc design cannot be nice for certain applications. It surely has its place.
However, I don't think the comparison pictures posted to the article you cited are very helpful unless you are trying to create specific smooth gradients on a wall.
In the comparison, the bare-bulb looks worse than the round head but
- note that they used a reflector on the bare-bulb design which is not helping (unless one wants to make the diffusion disc look good),
- even without a reflector, the bare-bulb would look worse as it wouldn't use any diffusion that's actually better for illuminating light modifiers. For an application in a good modifier you want an omnidirectional point source, not disc that only fires in one direction and less to the sides than on-axis. In particular in a parabolic light modifier, the more the light source approaches a point-source, the better.
Of course light modifier design can somewhat account for the light source characteristics, but you get the best options with bare-bulb designs.
Originally posted by inkista The spread is still going to be more restricted, ...
Yes, that's exactly why I think that every strobe should give one a bare-bulb option in one way or another.
The Profoto designs look slick and seem to support easy mounting/unmounting, but they are less than ideal for many types of light modifiers.
Originally posted by inkista ...but a dome diffuser might help with that.
Yes, of course, but such a diffuser will also eat some light (not diffuse it but turn it into heat). You can attach dome diffusers or other diffusion gadgets to speedlights as well but that's just a workaround with disadvantages, not an ideal solution.