Agreed! Think its kind of crazy that ALL super admins are getting emails to approve.
I also submitted an idea last week about this: https://community.hubspot.com/t5/HubSpot-Ideas/Be-Able-to-Pick-What-Super-Admins-Can-Approve-Marketing-Emails/idi-p/954979/highlight/true
I took it a step furrther and would love to be able to assign certain emails to certain super admins. Like contact owners A-E are with super admin 1, F-O are super admin 2, etc.