The browser gets pinned to the desktop and taskbar. It not only immediately launches itself but tries to convince you to migrate away from your existing browser. And if you refuse this the first time, the next time you launch a website Windows 10 will once again ask you if you really don't want to use Edge.
Furthermore, it seems that it's also no longer possible to uninstall Edge.
The only justifications the company could provide me are that, technically, the new Edge is replacing the old Edge that already comes with Windows 10; Microsoft wants you to use the best, most secure version of its browser; and you can still say no — though in this case, a “no” involves force-closing Edge, reaffirming your default browser choice, and having to spend a minute deleting unwanted junk on your desktop.
A Windows 10 update forces a full screen @MicrosoftEdge window, which cannot be closed from the taskbar, or CTRL W, or even ALT F4. You must press "get started," then the X, and even then it pops up a welcome screen. And pins itself to the taskbar. pic.twitter.com/mEhEbqpIc7
— Taran Quarantino (@TaranVH) July 2, 2020