Follow-up Comment #2, bug #64494 (group groff): I think the general idea here is that ems are used more for typeface-relative measurements and that ens are used more for measuring runs of text.
When dealing with proportional type, ens are useful in approximation, whereas
ems are more precise, which is probably why formatter requests that take
horizontal measurements as arguments tend to use `m` as a default scaling unit
rather than `n`.
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