[jmilloy]

I also think there is a lot of room between flag-worthy and front-page-worthy. Any legit review my startup gets main page? What minimally counts as a startup?

On the other hand, low-scoring "show" submissions might especially stand a lot to gain from constructive feedback, something (as noted) they probably don't get when they don't make it to the main page.

Separating show submissions to a new tab allows you to use upvotes appropriately and distinctly. I would upvote startups as "news" in a different way than I would upvote startups as "review-worthy."