First and foremost, we need to acknowledge that even though the funding goal has been met–it does not meet the realistic costs of the project. Bluntly speaking, we did not have the confidence to showcase the real goal of ~1.5 million euros (which would be around 10k backers) in a crowdfunding world where “Funded in XY minutes!” is a regular highlight.

I am open to discussion but I don't want to jump on the conclusion.

The biggest reason is that we still have several options, so I didn't want to restrict the future possibility.

You can afford to make a proper PR to upstream.