Something that makes me a bit reluctant to "just ship it" is that you can post things on HN and producthunt only once, so often I'm motivated until I do that, so that my launch is more succesful, but then later I think: Only a few users, is it even worth it to keep working on this? I wish it was possible to keep people who upvoted/liked your product updated. Or maybe poll them on things like: Would this feature be valuable to you?
If they like it enough to sign up/give you their email, what’s preventing you from sending them an update? Or sending them a simple questionnaire?
I would be careful when considering an upvote a positive signal. At the best, it’s someone showing they are just on the line of being interested enough to sign up. At worst, it’s just empty validation for an idea that won’t work.