The fact that the page titles can be changed in edit mode is not so visible anymore

This change was done on purpose in order to:

• align the standalone edit mode with the inplace edit mode; the title now looks the same in both modes; if it wasn't a problem for inplace edit mode then I don't see why it would be a problem for standalone mode; note that the end goal is to create new wiki pages using the inplace edit mode, see XWIKI-19299, so I see this as a small step towards that goal; using the iframe-less CKEditor mode (no border, floating toolbar) could be another step;
• make the BlockNote integration nicer; BlockNote doesn't have (by default) an iframe-mode (border, fixed height, fixed toolbar) so it looks the same in standalone and inplace edit mode; this means that when BlockNote is used the standalone edit mode is already very similar to the inplace edit mode:
  • 
  • 

I don't see this as a regression. Any user that wants to change the title would click on the title and discover it is editable, same as in inplace edit mode, same as in Confluence and Notion:

For me this is a Won't Fix / Invalid issue.