Safari 12.1.1 will write a folder of weblocs from its Bookmarks page, but forgets to close and release those files. Look at the problems which result.
TextEdit will happily trash an HTML file when you convert it to text – without any good reason, other than an engineer not being familiar with macOS.
How reliably does Legacy Software detect 64-bit compatible upgrades? For some apps, it doesn’t notice at all, it appears, and continues to give wrong information.
This error message can occur when running any command tool, or an app which calls a command tool, in 10.14.3 and earlier.
Release notes, three major bugs fixed (and plenty more too I suspect) – that’s got to be good. But there’s also the matter of broken command tools on previous versions.
Look in the Dictionary app, and entries are fine in Dark Mode. But access the same content via Spotlight, and they become unreadable. Why?
Want to increase the size of a disk image in APFS? If you’re relying on Disk Utility to do it, you’re out of luck. But here’s how to do this at the command line instead.
In Sierra but not Mojave, when the user opens an ancillary window, it appears for a moment, then vanishes. Is it a bug in the code, or in AppKit?
Want to use App Shortcuts in Mojave? You’re out of luck because its broken, and Apple can’t be bothered to fix it.
With APFS, Time Machine underwent major change, to using snapshots to determine what to back up, rather than FSEvents. How well has this worked?