I find the 
new icon rendering in Mac OS 27 (Golden Gate) much easier on the eyes.
https://basicappleguy.com/basicappleblog/macos-golden-gate-icon-comparisonThe old ones triggered the autofocus sound in my brain, like a camera lens struggling to focus.
Good for us who suffer from astigmatism
Today, I ran into this new feature in Google Docs for the first time.
It allows you to create tabs within your document, which become like separate pages or chapters. Every tab is isolated from each other, you cannot scroll from one tab to another. I expect this to lead to a lot of confusion for people unaware of this feature.
Discoverability leaves a lot to be desired.
I am a heavy user of document outlines, which are now integrated in this feature, so it looks like I will be using this anyway 😬.