First, the ‘New Project’ button is now easier to track down in the projects browser. It’s basically the first option in the library.
Apple also increased the thumbnail views for all movies, and lets you edit projects with a single click. When you click on a clip, it now selects the entire video instead of a portion.
If you do want a range instead of the clip, hold down the ‘R’ key and drag the slider to grab a piece of video from your clip.
If you have an Apple TV or iPad Pro, Apple also supports native preview resolutions for each (1600×1200 for iPad Pro and 1080p for Apple TV).
Though it’s still a trackpad and keyboard experience, iMovie for Mac is a lot more like iOS with its default to select entire clips and range selection. Aesthetically, it’s also a bit more familiar for iOS users, which may encourage casual users to turn to it on the desktop, too.