I manage a Hub Site that houses 6 or 7 pages in addition to the Home page. The bottom of each page has a row of our logo + some contact info. My non-GIS supervisors like to tinker with little changes (change the numbers to italics, small stuff like that).
The rub is that when they finally get it looking how they like it, I need to go make those changes to each of the pages on the site, save, and publish them.
Long story short, I wish there was a way to link elements so you don't have to copy the formatting across pages.