Polished as in window animations, tastefully done transparent windows by default on hardware that support it, snappy application menu, desktop and file manager icons that conforms to grid, black title bar with white fonts is a too strong to name a few.
In my opinon, There must be one release tailored towards UI improvements among the three releases that leads to LTS preferably as the one that follows LTS because there is a solid platform to build upon and there is enough time to iron out UI bugs in the next LTS.
The theme is also quite dark. Notifications are black, background is dark: It makes me feel claustrophobic compared to a macOS. Maybe, generally, hire more graphic designers.
In my opinon, There must be one release tailored towards UI improvements among the three releases that leads to LTS preferably as the one that follows LTS because there is a solid platform to build upon and there is enough time to iron out UI bugs in the next LTS.