[dang]

Yes. Things like a showcase page, an email-signup page, or a fundraising page are often not very substantive. The best kind of product post is a Show HN pointing to something people can play with. The second best is a detailed description of the product and technology.

Because HN generally doesn't allow reposts for about a year, it's not usually in one's interest to post about a product too early. It's better, for both the product and for the community, to wait until something is ready for the sweet spot of HN.