That is true, not contesting that part of Xiaomi (manufacturers like them lead to the stereotypes that Eve had to address on their trip to the manufacturing partners), but the #0% seems high...
And yes, this market definitely needs something of Eve's quality! ideally you could take the innards of the V, adjust the battery (maybe do some rearranging internally), and assuming the same thickness tablet, end up with something nice while getting to somewhat build off the design efforts of the V.
Just to chime in here on thickness thing, while I do agree portability is important on a tablet this size, keep in mind a few things:
Unlike say an iPad, this would be running Windows. This means that more of the device proportionally needs to be battery to maintain good battery life, which is a very dense material. (The downside on a portable device is that while Windows has improved it's mobile/battery optimizations, a Windows device will never be as efficient as an equivalent iPad due to the fundamental nature of how Apple can micromanage the OS and parts. This means specs like these are needed for a good experience on Windows, and to run the x86 processor and more modules of ram, it costs more battery drain.)
Just doing some ratio calculations, going from 12.3" screen to 9" screen reduces size ~73%, which for the 840g Eve V, would scale to ~618g. That's assuming a few things scaling proportionally (which it wouldn't really, your processor, Mobo, ram, storage, etc can't change size), but that's a decent ballpark. All that to say, it would be quite difficult to get a sub 500g device, let alone 400g device. Even the nexus 9, which was primarily plastic, was ~435g, and that had a custom ARM processor from Nvidia, only 2GB of RAM and was running Android.
If they made a few tweaks, like if they went with a 3.5W TDP by default on the M3, you could theoretically go with a smaller battery for the same battery life and make the device proportionally less battery (potentially slightly thinner and lighter). Perhaps an option for Eve could be to make 1 chassis for the LTE and Wi-fi models by stylishly integrating the antenna design into the casing (maybe going a little bit more plastic, but keeping it looking good and feeling good to use?))... But feasibly speaking, I'm not sure that Eve could design an Ipad-esque device not compromise on either a good user experience or on weight/thickness. I think that's a major part of the reason there really aren't competitive, small Windows 10 devices made of aluminum. They seem to either go plastic, or scale up to larger screen sizes. But hey, I'm in civil engineering and just follow tech stuff in my free time, so I may not be the best to ask authoritatively, I can just try to do some deduction, haha. Perhaps we could see if someone from the team has any thoughts?
Honestly on the thickness side of things though, I can see it being crucial to some with a phone, but on a tablet I feel like the thickness question is overrated somewhat, and is really less important/noticeable. At a certain point (having held a 9.7" iPad Pro in store, at least), too thin can be somewhat off-putting, and actually make a device feel more unwieldy/cumbersome (especially if the weight is too much greater proportionally! Looking at you iPad Pro 12"!) Anyway, it is something to consider, if we can't get it to be an iPad type dimensioning (ie thinness and lightness), is it something people would want to buy? How much of a trade-off is comfortable? Is 550g okay? If we went to an 8.5" or 8" screen to get the weight down (proportionally 583g and 549g, respectively), would that still be okay? I feel like the user experience side of things is something Eve won't compromise on, but perhaps there are more "Mobile compute" changes that can be made to the specs to further optimize the battery question and resulting weight without hurting experience (more what I was getting at with the Atom processor questions).
Your point is taken, it really should either be now (build on current design process) or down the road where a new feature-set can be introduced. As far as when is "far enough"/"too far" to wait, that's always a debate to be had. I was really just looking at the next possible Atom (properly the "x7") chip release, because there isn't a current generation release of it (hence why not now).