Hi @Marc-Andre_Mailhot and welcome to the Forum:wave:
As @Bastien_Siebman explained to you, that it’s the best way to reduce notifications on existing tasks you’re following.
Also, as it stands, it is not possible to select which tasks you want to be notified for, notifications are automatically enabled or disabled for all tasks. To learn more about notification, I’d recommend checking out this article from our Guide: https://asana.com/guide/help/email/email-from-asana
If you haven’t yet, I would recommend having a look at this thread: More options for Email Notifications so you can express your feedback and vote for it.
Have a great Wednesday!