I've had zero issues. Then again I worked at NeXT and Apple and have been running variants of OS X back from when it was NeXTSTEP. I know this OS.
I could give you a long list of bugs, that have nothing to do with user ignorance. But the list is actually so long and complicated that I'm not going to spend time on it... I've already sent it to Apple.
There are also several missing professional features, that may or may not have been present in earlier macOS's, but they've become quite obvious with this troublesome release.
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I really don't know how macOS is going to survive in the future. The market share is shrinking not expanding. They lost over half a percentage point around the world in just the last quarter alone. Thats HUGE when you have less than 10 percent of the OS Market. Android use far exceeds Apple iPhone around the world. Same thing with Windows 10. And with Catalina dropping support for 5.1 Mac Pro's and older MacBook Pro's The macOS will see even more people leave Mac and go with Windows 10 with Windows 10 runs on quite a few older machines. I have Windows 10 running on IBM Thinkpad T520's , T530's, W530's and even IBM X301's WHICH ARE 2008 BUILT MACHINES. WINDOWS 10 runs fantastic with user replaceable SSD drives and upgradable memory to 16GB or 32GB for the W530 Thinkpads 2011 machines! iPads and Iwatches are a different story as They are dominant around the world
Blocking Nvidia without replacing CUDA with an open standard is one of the most idiotic choices Apple has made. It seems like management somewhere misunderstood a roadmap planned years ago, when they changed their strategic direction from the Vulkan API to the proprietary Metal API, but had already made a decision on getting rid of the proprietary CUDA standard. The intention was never to replace on proprietary standard with another.
The decision gets even worse considering that AMD is so far behind Nvidia. Supporting AMD by exclusively using their GPU's in Apple's own builds is probably a good idea, to avoid a monopoly, but blocking Nvidia 3rd party GPU's are not.
Blocking H264 and H265 acceleration on older Macs, with capable GPU's is another customer unfriendly idea.
Blocking Catalina on about 7 year old professional Mac Pro's (sold before the 2013 toy) is also a really frustrating concept for professional customers. Th 7.1 Mac Pro ecosystem is not mature enough yet, and the price/performance of the current generation of W-Xeon CPU's are off the charts...