Earlier quoted context omitted.
Bullshit. Undo in a macOS text entry box is part of the widget’s implementation and you get it for free. It doesn’t need to be tied to the app’s state, since it’s just working on the text you put into the box. Have you actually built any native macOS apps? I have.
Ah, my apologies. I thought you were talking about something like an undo button, rather than cmd+z within a particular text box. Sure, point taken. Native widgets might work differently than cross-platform ones. That said, there's no reason a cross-platform widget couldn't work identically to the native one. Indeed, a platform's native widgets an effective way to give users a consistent style and functionality acros…
Ironically, out of the apps I use regularly, the ugly, misbehaving apps built with cross-platform frameworks are from big companies that could easily afford to do it right, like Slack. The apps I use that come from small indie developers are all native. I suppose this is down to competition. I tend to have a choice for those apps, so I can choose ones that work the way I like. For Slack, my choices are to use the app, use it on the web (same as using the app, more or less), or find a new job at a company that uses something else.