OP here. I totally agree with your statement in that it's becoming easier and easier for single developers to build (and launch) something cool.

I suppose I must have glanced over this when I wrote the post, but I'm definitely targeting Grow towards producing content-heavy informational marketing web sites, blogs, portfolios, landing pages, personal sites, corporate information pages, marketing campaigns, etc.

In other words, Grow is great for teams that want to produce and manage stuff like the marketing content you see on https://stripe.com/, http://about.pinterest.com/, http://www.apple.com/mac/, http://www.google.com/think/, etc. I wouldn't recommend using Grow to build your actual product. :)

Often times, coordinating the launch of your marketing content with the launch of your product is tricky, and that's another thing I aim to solve.