This is hugely important. If the user is able to right-click and change the header text in a modal dialog box, and the links to it are (in my experience with 5K+ notes) instantaneous, why is there a “performance” issue to detecting whether a header has been modified (in regular editing mode) and do the same thing?
I would add a side-feature-request, which is that, when creating a link to a header section, by using the # key in, it autofills the full header path, not just the header pointed to.
→ Full header paths inserted when auto-filling internal links to headers in a note