Comparing a drinking glass to a flat pane of glass is apples and oranges. A larger flat pane of glass will naturally have more flex to it than a smaller pane of glass, especially as thin as the substrates are in ereaders. Going from 6" to 6.8" is probably not going to be a lot more flex to it, but the larger you go with a flat pane of glass, the easier it will be to flex and break.
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