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That's my point, it's a common shortcut for manipulating text in other apps, Word, Wordpad, Photoshop. It would be very useful to be able to use it in the XF text editor.

This has nothing to do with changing the editor font size, this is to do with browser zoom, as you've stated.

If you want to create rich text posts with structure and heirarchy it's useful. Users can still change font size with the editor buttons or copy and past different font sizes if they're that desperate to do what you've used as an example. This is for power users who feel comfortable manipulating and navigating text with keyboard shortcuts. To make it easier and quicker to write better structured and formatted long form posts, the opposite of your example.