Than you for your insight! To be honest, the poly route is just a little extra, that will add fan service, as you well said, but will add very little to the general storyline. It was a Kickstarter extra, and I think some people will enjoy a handful of extra sex scenes. So you can skip that option completely when it's released if that's not up your alley.
And what do you need the game doesn't have CGs?? There are many of them! You even have a CG gallery where you can see the ones you've unlocked.
Could it be that you mean animations? If that's the case, I'm sorry, but no, the final game won't have animations.