Well update on this. The idea can be deleted.
Turns out send sample email is included in the "edit email" permission, not "approve email" permission (despite Marketo Support tellin...
Currently the send sample email functionality is only available to users with the "approve email" permission.
Send sample needs to be its own separate permission.
When we onboard ...
As of January 2021 continuous audience sync is available, but it's only available for static lists. Would love to see this introduced to smart lists as well.