Undiscoverable UI madness
I stopped there because we had to get back to work, but without even leaving the Finder and Desktop I was able to find a bunch of things that long-time Mac users had never known about because they never discovered them in their daily use.
None of this is meant to say macOS is garbage or anything like that. It's just interesting to see when people who love the Mac and are so critical of "discoverability" on the iPad. I'm not even saying the iPad is better than the Mac here, I'm just saying that "discoverability" is one of the big things that has people in a tizzy right now about the iPad, but I think some are laying into the iPad harder than is warranted.
You have no idea how many undiscoverable or obtuse features, functions, tricks, and so on you take for granted when using old, established platforms like Windows or macOS.