Yeah, not going to do that since Alfred text expansion can’t sync back to my iOS devices (where I do most of my actual writing and note taking actually).
Yes, this is a bummer! I tried with BetterTouchTools and implemented a / feature for a note template using /template and I can confirm their shortcuts work but the builtin macOS ones don’t work at all. Like you, my main reason for using the builtin ones is because it syncs with all my devices automatically so I don’t wish to add another app to my workflow for text shortcuts.