Nice, thanks for pointing out that EXT. As T3 developers we do not really need the FE editing especially as it more a corporate cms than former blog for private users. 
Once set up users do not need to fiddle with the page structure, but content. In addition administrating serveral sites makes it nice to rely on the same BE appearance. Nevertheless I think the underlaying issue is time and/or money. IMHO a button next to the content element with a jump mark link to the BE e.g. /typo3/module/web/layout?id={page_id}#element-tt_content-{content_id}, if the BE user is logged in, would be a nice and simple core addition. Having to show editors the page id in webdev tools, entering it into the search field and finding the corresponding element on the page is time that you can save. I quickly tried a button to {page_id}, works. But the BE doesn’t like the parameter {content_id} for jumping, why?