the timeline editor feels often unfinished. Setting the time cursor to a different time is often not reflected in the preview. You either have to click a clip or wait.
sometimes the cursor even disappears, eg. when switching tabs to shadergraph
Not being able to select and move multiple clips is missing.
There is also no snapping to clips or time cursor as found in other tools.
And then there is the timeline compile bug https://developer.apple.com/forums/thread/810868
The timeline as it is, is a good start but it definitely needs some more love to be on par with other commercial tools like Unity or After Effects.