So really, given that constraint, the two options for plausible layouts are actually like this screnshot (taken from https://jsfiddle.net/dholbert/f92xyk5a/ which requires Nightly to render since it uses the `aspect-ratio` property) As you can see, the option on the right makes better use of the available page area, which means it will produce a less-severe scale factor; so it's what applications pick (for this page size, and really all commonly-used page sizes).
Bug 1669905 Comment 5 Edit History
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So really, given that constraint, the two options for plausible layouts are actually like this screenshot (taken from https://jsfiddle.net/dholbert/f92xyk5a/ which requires Nightly to render since it uses the `aspect-ratio` property) As you can see, the option on the right makes better use of the available page area, which means it will produce a less-severe scale factor; so it's what applications pick (for this page size, and really all commonly-used page sizes).
So really, given that constraint, the two options for plausible layouts are actually like this screenshot (taken from https://jsfiddle.net/dholbert/f92xyk5a/ which requires Nightly to render since it uses the `aspect-ratio` property) As you can see, the option on the right makes better use of the available page area, which means it will produce a less-severe scale factor; so it's what applications use in practice when doing 2-pages-per-sheet (for this paper size, at least -- and really, all commonly-used page sizes. The theoretical 1x100in page size is the exception where the preferred option would be reversed.).