Sapioit a php script which to fetch an archive from a CND and unpack it, for the latest version of everything
You know who developed exactly that ? The Composer team 😛 It's not used without reason, it does a fantastic job to this very task: host, manage, download and handle versions between all packages !
I don't think Flarum should drop it, it's a big plus to help code quality. However making user-friendly interfaces around it is definitely a necessity. That's what we've been working on at Flagrow with Bazaar.
I guess you mean CDN by the way ?