I've been learning a bit of Swift / SwiftUI recently while building a macOS app and this seems to be a problem all the way down the tech stack, even for simple apps.

While it's been surprisingly easy to animate things, I've spent way too long trying to synchronize the movement of different components, to make sure things don't jump around, etc. Window content snaps to size while the borders animate, the shadow doesn't refresh alongside the borders, that sort of thing. Maybe I'm missing something in terms of how I should set up my code, or maybe it's a hard problem to solve automagically in a framework.

In some cases I basically gave up on slow animations (which make the issues obvious) and rely on fast movement to hide the imperfections - but it creates a less polished feeling as the article points out.