Sorry I didn't see this until now. The intention here is to embed a micro-frontend into an existing WordPress page, so I don't think you'd have any need for using routes. What you're asking about may be more relevant for a full Vue SPA.
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In history mode we need to modify .htaccess file so when you refresh it does not return a 404 error. v3.router.vuejs.org/guide/essentia...
What would be the rule in a plugin situation
Sorry I didn't see this until now. The intention here is to embed a micro-frontend into an existing WordPress page, so I don't think you'd have any need for using routes. What you're asking about may be more relevant for a full Vue SPA.