Everyone currently in my household (me) knows. Been exploring it more since TextExpander went subscription model. These days it suits my minimal expansion needs. Sometimes I set up Replacements and later find it takes more time to remember the shortcut than typing from scratch, since I’m not using them often enough.
I also did not know about the export and other options, thanks very much for pointing them out!
I’ve also wondered how dicey it would be to use them for say username-password combos on a device that rarely leaves the home but connects online over wifi. That is, could automated or human attackers find and use combos over the internet (all bets are off if device is stolen of course).
The ‘documented’ link @ace shared (and others) indicates the replacements can be used across Apple Devices if the user is signed into the same Apple Account and uses iCloud Drive. Which is of course different from say, exporting them on Mac and importing resulting file to say, an iPad over AirDrop or via usb chip-Files App. Although Apple vaguely states on the page “You can also send it to another person to share it with them”.
I wish Text Replacement did, but LauchBar does. I often rename files with a shortcut for the date, which worked with TextExpander simply by typing the shortcut text. I haven’t found this functionality in Text Replacement yet. With LaunchBar, invoking the App thru its shortcut, followed by the desired textual shortcut and Enter, is a few more steps and so not so worthwhile in this case but it could also be used for more demanding and perhaps multiple expansions (see Snippets & Placeholders).