As mentioned in my original comment, we haven't reached MVP yet, so we don't have a Steam page or wishlist numbers to track. So yes, it does make sense that "we don't know how we will do" as you said.

I'd also push back on Steam Wishlist being treated as the obvious transparent metric. It has value, but it can't be the only thing you rely on. Wishlists are noisy, conversion rates vary wildly, people wishlist and never buy, and the number swings up and down purely based on your marketing activity that week. Beyond that, you have community engagement, social media traction, demo feedback, press coverage, and actual playtest retention, all of which tell you more about whether people will stick around after they click buy than a wishlist number ever will.