In Google’s G Suite version of Gmail, access can be delegated so that an assistant or colleague can review your inbox, respond as you, etc. For execs to use Asana, this is a critical feature. Optimally you could go to your profile settings in Asana and select an other user in the same org who could use Asana as you. This exists in Gmail, O365, Salesforce, and many other apps at the enterprise teir.
Not having this functionality makes it impossible for us to really engage with executives who have an assistant via Asana.