Yes, it's generally the "welcome" or "community rules" that are pinned for a long time, sometimes years and I feel uncomfortable that these will be hidden from initial view.

I could work on the opposite approach where the initial view shows all of the pinned posts and when the user selects "Collapse Pinned", then they can disappear and that setting can remain stored on their computer. It's probably the people who visit a community regularly that get most annoyed by having to scroll past the pinned posts every time so this feels like a better solution. Thank you BFF3Bs.