I also think this function is very necessary.

I think the best solution would be if the subject included the name of the Space, the name of the List, and the name of the Task also. And the sender name would include the name of the person who did the change/comment at that task.

This would be helpful for us as well to prevent unrelated email notifications from automatically threading in Gmail / Google Workspace.

To give a more specific example, we've been trying to use our own in-house project templates more this year. If we have a template for creating a new blog post, one of the steps of the process might be "Review copy with client". If we're working on multiple blog posts at once, across multiple clients, when that task is updated and notifications are sent, they'll end up in the same email thread because the subject line is the same (in this case the task name). Being able to include the space, folder, or list names as options in the subject lines would make these much more useful to our team.

Yes this would be excellent, JIRA handles it very well for Task related email notifications:

Subject would read:

(Project name) Task Name

so for Clickup, perhaps it could be

(Space Name) | List Name | Task Name

simple and effective and gives the subject more relevance

naturally this is only needed for task communications and perhaps can be a simple Opt In for those who want it, however its likely a benefit all users would have anyway

When I get multiple notifications from my team members working on tasks, I have to open each email to see what it's related to. It would be much more efficient to be able to glance at the subject and know what was being worked on.