I really deeply wish they had attempted a profile that was 64mm wide folded and double unfolded. Height is less important.
The whole advantage of having any screen at all when folded is something quick to access and *one handable*. Just looking at the Duo, it appears too wide for that by a large amount.
If I’m forced to two hand the thing I’ll just get a phablet: no folding mechanism, no unfolding step before using properly, no gigantic price hike (guessing).
Are you left handed? The rearranging of the UI to provide navigation on the right side of the 5.4” screen seems like it was made for this exact purpose.