It’s not illegal to discuss cosmology and theoretical physics at CFI of course. But if you’ve ever lurked in a physics/cosmology forum where the real deal folks discuss things, you quickly realize that our layman’s-speak is pretty much unusable for these types of discussions. We may think we’re saying something meaningful when we talk about the expansion of the universe, matter densities, and so on, but it only seems that way. I’ve even heard young professors of physics at top notch organizations interviewed about some of this stuff and their response was “got me, this is way beyond me”. So if it’s beyond THEM, then us layman might as well just go back to enjoying the pretty pictures on Cosmos. (Unless you’re young and smart and have a chance of lifting yourself educationally to that level.)