That is an interesting idea. I will forward it to the rest of the team.
Now my opinion :)
What would be the gain of a website external to Steemit as everything is already available here? Moderation, of course, but with communities being soon available through steemit, we will have all what we need already here.
Ah, I am new here, and not sure what "communities" feature will bring, although I have heard the feature being mentioned before.
If "communities" helps with moderation within the site, that would be cool, and probably sufficient for SteemSTEM!
This is the idea :)