Well there you go.
There was a bug, which is why it never made sense to me. There still isn’t any proper documentation on Armature type parent.
I would guess that the “much easier to export” is from a software point of view, not a user point of view though.
Exporting with modifiers means the exporter has to calculate stuff in a particular way.
Exporting w/o modifiers means it’s easier for the exporter.
Or at least that’s my interpretation of that.
Thanks, Ignmar.