> Have you run into any cross platform UI bugs

Of course not, it's only for Mac. If they were to support Windows and Linux, they probably would not have published this post.

Cross-platform UI is hard, even harder if you want to keep almost the exact same UI, same feature set across platforms, and potentially an online version. People moved from native applications to Qt to web stack for a reason.

Saying this as someone who works at a company that develops cross-platform desktop application that has millions of users. I can't imagine what my job would be like if we were using any other solution.