The new Google+ UI has a few crucial failures:
1. Missing Events. What the heck? It is not like the feature is being retired. It is still present in the old UI and on mobile.
2. Choosing recipients for a post in the new UI is way as harder than it should be and far worse than it is was before. Previously you would just type the names of people or circles, now you have a limited drop-down menu of the supposedly the most frequent circles. To choose anything more complex than that, you have to choose "other", wait for about 40 seconds on a fast connection for the new page to load, and only then type in the people or circles you want. If you want to amend you need to open the same window again.