As the title suggest, it would be nice if the list of the addons of a certain profile, alongside with configuration of the addons, would be synced. It doesn’t require a lot of space, and would improve the UX when one has Anki installed on many computers.
The only problem would be if you tried to sync different versions of Anki, the addons might not be available similarly everywhere, but you could just force the addon to be disabled non-supported Anki versions.