Earlier quoted context omitted.
For anyone not familiar with previous designs, each component in https://m3.material.io/components has a "comparison with Material v2" section.
Biggest change seems to be that everything is round and purple now. It looks more playful and less professional. Edit: I dislike their recent color picks. First that teal in Google Maps, now the purple. Why? Are they trying to copy the color paltette of the first Mecedes A-Class (aka "Listerine" colors [1][2])? [1] https://prestigeandperformancecar.com/wp-content/uploads/A97... [2] https://image.stern.de/31749130/t/A…
That's intentional. Google's UX research is telling them that's what users (between 18 and 34 specifically) want more of.