I don't think you understand my point, a 222 for example does not light up like a 2m wide reflector as you claim. Defocused the big paras are made up of lots of very small specular light sources at the very tip of the reflector so looks completely different to a 2m wide modifier and resulting output is quite different also to the smaller paras.
I have never compared a Para to a regular reflector, we're talking light quality of the smaller paras vs the larger. And of course a bigger light modifier will produce different results than a smaller.
But here's an example. I have attached a shot of my own Para 88, defocused and a screen grab of a tutorial from Karl Taylor and Urs Recher with the Para 222. Judge for yourself if the results are as different as you say. I would argue the difference is pretty much size only and not some kind of magical quality to the inner material.
Anyway, this is pretty much a meta discussion about basically nothing at all. The point is, the larger the source, the softer it is. It all depends on what you will be shooting that dictates how large you want your source to be. The Paras differ in the fact that the light can be soft, hard and anything in between.