Hey IronCross - I definitely understand where you're coming from. We are doing another demo for a few reasons:
1) Platform- we really want to continue to have new players check out The Vale. The recent Xbox event brought a lot of people to us who couldn't play on that console. So we want to give them a chance.
2) Testing/Feedback - Even though a lot of things stay the same, we're still always looking for feedback and where we can change things. Even feedback-related changes that can't be implemented for The Vale can be used in future titles. Please note that we are definitely striving to include new content for ardent players like yourself. Though I completely understand if you want to sit this one out and save yourself for the full release.
3) Promotion - as we gear up towards release, we've found this is a great way to garner interest/support. Also, we're happy to be pushing this one on itch.io as well! It'll be a great chance for us to wet our toes with the platform, and an easy and DRM-free way to access the demo.