I’ve noticed that I can use variables from the meta site in the real site container although autocomplete is not working. The article doesn’t mention this explicitly, but can you confirm that I can use it this way and that there is no need to duplicate variables in a site container for use in site tags?
The tag trees for both metasite and site are merged. So, effectively, variables should work. Since it’s the first version of this feature, there are missing parts. I presume that you see valid use cases for using variables like that. I’ll fill in feature request to add autocomplete in this case.