I think it would be a very good idea to be able to simulate the tasks before launching them and when validating them.

Somehow this could indicate how many mails would go to how many recipients or if you are in update/insert it could indicate how many records and where they would go.

It is very common to create tasks that send mails to several people but it is very important to make sure that it is really what you want and that no customer or user receives something by mistake with other information.

It is true that there are ways to simulate this if we insert records in a test table but it would be more comfortable when creating the task.

Regarding triggers, it would be interesting that when you do massive data replacement the system warns you that there are triggers that send mails so you remember to deactivate it.