Snow Leopard was so buggy that it had an infamous data loss bug: https://www.reuters.com/article/lifestyle/snow-leopard-bug-d...

People forget these things after they get patched out and time passes. What's left behind as memories fade is a feel-good mythology about a bug fix release that never really existed. The truth was that engineering resources had been shifted to iOS, which delayed Leopard, and the "no new features" marketing was a way of justifying the lack of resources.