Are you here just to market your product or really want to listen to the opinions of GH members who care to leave some comment?
I have to be frank, it may sound not so pleasant, but it is perhaps a piece of more valuable advice for you.
Your words contradict yourself in your design just to defend what you want or not want to make for whatever real reasons (fear of not appealing to the "majority" or whatever) but not really for a design principle. I see no consistent design principle in your current design, not at all:
If you bother about user's hands not moving, then why bother to have a separate traditional nav cluster on the right? Why bother to have a separate F-key row? Or even the number row where fingers need to reach further?
Of course you can sell a keyboard like this cheap to some people in the vast mainland China market, no problem for that. But to sell it in the international keyboard enthusiast market in a premium price as "an ergonomic keyboard", there are quite a few competitors for you. These competitors mostly started as hobby projects with a perfectionist mindset, and have spent years improving their designs.
Mechanical keyboard is a niche market, and ergonomic keyboard is a smaller niche market. So it is not easy to earn big for you.
The most direct competitor of this design as an orthholinear keyboard with arc-shape row arrangement is the Atreus keyboard. In my opinion, the Atreus beats this design in every single aspect. The added F-key row and nav Cluster make this design a Frankenstein - not an ergonomic design at all. Perhaps what he Atreus needs is more capital, access to milling and molding machineries, as it is just a small scale side project of the maker, not aiming to shoot for big profit.
As a keyboard this big, another competitor is the ErgoDox. This design looks like a joke in front of the ErgoDox. As an example of how people make money out of hobby projects, you can look at ErgoDox EZ. The creator of ErgoDox EZ is mostly a facilitator, but the tenting mechanism is well designed and can please most except a few ergonomic theorists here. Where is the tenting mechanism of your design by the way? Or even bother a molded curving case like those in Microsoft natural keyboard or the Maltron or Kinesis?
Do you notice all hardcore ergonomic keyboards out there have no backlighting? Perhaps except the Planck if you count it as one. Because those who care for ergonomic design mostly don't care for these flashy light show features.
I know your real principle is "something that sells reasonably well, and that can charge more outside mainland China". Not objection, that should be a goal for every businessman, not necessarily a goal for many hobbyists here - they put lots of money from their real jobs and other sources in their hobby projects.
Please listen for real. And please stop answering with fake reasons and "design principle" that doesn't hold for your design. Be open about the real reasons behind and your concerns, you may find some nice surprise.
e.g. You may even create a poll to see how many ergonomic keyboard users are here, and for those who use one do they prefer an F-key row or a separate nav cluster.
First of all, thank you for your opinion on split the spacebar and put some functions button in the middle. We will bring it in our optimization.
Don't get me wrong for the row below F-keys, as I said, we are still doing lots of optimization.
The reason I said it against our design is that, we plan to put the media keys combine the F-keys, simplify it instead of making it complicated.
Again, your opinions is valuable, I know that media keys in important for a keyboard. Our current design is base on lots of tests and surveys,
most people prefer to simplified the buttons that they don't use that frequently. But we will reconsider all of your opinions and bring it to our optimization. Thank you, and we can send you one once we have finished samples, if you like to give this a try.
Looking forward some other valuable opinions from you.