ChatGPT MacOSX is the only software that regularly crashes on my machine when its memory consumption for no apparent reason spins up towards 50 GB.
And that software is build by some of the highest paid software engineers on the planet with full access to all the LLM compute in the world.
Coding is a solved problem. They simply don't care if the app is full of bugs. You are using it anyway, right?
Yes, but it's also built by people who would rather tinker with AI than build MacOS apps. Intrinsic motivation is very hard to beat, especially in subtler areas like good UX or performant software.