Because system-admin rights are for doing system administration. Not "I can see/do everything" - that's a terrible permissions model, and thankfully one Atlassian stay away from.
As a system admin, I don't want to be able to see everything in a 5000 space, million page Confluence, I want to see the spaces that are relevant to me.
For the "invisible" spaces, check the permissions - you can still do that as an admin, even when you're not able to see the content.
Do you use templates with Confluence? Take part in a remote 1-hr workshop. You'll receive USD $100 for your time! We're looking for people to participate in a remote 1-hr workshop...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs