Hey guys,
Just to come back to the usage of templates on Wikiquote in French: it is linked to the reopening of this Wikiquote instance a few years ago. Indeed, it was agreed to reopen fr.wq only under the condition that all quotes would be appropriately referenced. We decided early on to use templates to facilitate this, as those templates can automatically identify and highlight incomplete references. On top of that, they ensure that all pages have identical formatting.
AFAIK, this hasn't been emulated on other Wikiquotes.