The size of some infoboxes overwhelms lead in many Wikipedia articles (see for example, this discussion). It is therefore desirable to collapse certain sections of the infobox. {{Collapsed_infobox_section_begin}} can be used collapse sections of infoboxes. This works when displayed on the desktop, but not on mobile. The MobileFrontend should also support collapsing of sections of infoboxes.
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Editors are not supposed to make the assumption that content is collapsed when they indicate so in the article (MOS:DONTHIDE). So I do not consider it a problem that a section of an infobox is not collapsed.
However there is of course a general usability problem with navigation and infobox sections. Maybe like on the mobile apps, having this collapsed under a 'quick facts' or something dropdown, might be interesting. Or we can make it easier to skip through the article at a higher pace.