A send email action could help a lot with integration with other apps and services.

One use for this would be to parse text messages or notifications for dates and times, then email the message body to a task manager app (Todoist or TickTick) so they'll automatically be added to your schedule. 

With this you could use Tasker to get total integration between a task manager app, email, calendar app, and your phone.

I know there are some plug-ins for this, but I think it would be a very useful feature for Tasker to have natively.