On the back of this discussion https://totara.community/mod/forum/discuss.php?d=25356

A digest of workspace notifications would help with minimising the 'noise' generated by workspaces.

A user could be a member across many different workspaces and want to be across the notifications but not receive a separate email for each notification.

The ability to opt into a digest would help minimise the number of emails received (in an already busy inbox).