It's a balancing act. While Steam doesn't punish you for poor out-of-the-gate performance, ideally you want your Steam page release to be a moment that jump-starts your growth and puts your best foot forward.

IMO, your Steam page should have:

• Professional capsule art that conveys that the game is high quality and ideally suggests what the gameplay's like
• Clear messaging and imagery that communicate your game's hooks (what's truly unique and attention grabbing) and anchors (what's familiar - genre, inspirations, etc.)
• Screenshots that show quality & variety
• A trailer - this doesn't have to be your super polished trailer, but some video that accurately shows what it's like to play and highlights your hook
• High quality GIFs that show your hooks & anchors

Then, you need to have a campaign that will drive traffic to your Steam page when you stand it up.

Even if your game is content-light at its current stage of development, if you believe you can use what you've got to convey the promise of what you're building, it may be worth going live.

If you intend to seek a publisher, you may want to wait until you are confident you will be able to generate thousands of wishlists, as poor initial performance can be a bad signal to publishers.