I think I'm misunderstanding your post as your 1st two points are on the positive side? I believe it's possible to have a bezel-less design or extremely close in a few ways. The display doesn't need to be curved to be considered 'bezel-less' because that can be achieved with very thin bezels. If they find a way to reposition the Ear piece or using actuator style speakers that would be the top bezel sorted but I'm guessing the latter would be too expensive.
The mic is already positioned near the charging port so to get the bottom bezels thinner, they would need to rethink the internal components. They are already working on an under display front facing camera and software would not be a problem since the aspect ratio would be almost identical to what we currently have. The sides are very easy to do where the corners would pose a greater challenge in my opinion. I'm just guessing here but I think with a few tweaks it can be done but there may be other factors affecting this which is why I suppose it haven't happened yet. We can dream still though.
Hey ! Thanks to share your thoughts and opinion 😀👍!! I'm sorry that I forgot to mention the device could have a *flat display* as an option since there is verity of people who actually prefers flat displays over waterfall displays!