How do I remove Edge and IE so Edge Dev is opened by, say, Windows Update?

Oh. For PDF I (always) have Adobe Acrobat as my default to open/edit PDF files. I can't speak for that but outside of that Edge Canary in Windows 10 is my default without any problems. As Tom said, Edge Classic will be gone in due time. IE even though it's incorporated into Windows 10, and still getting security updates, it is "not being encouraged" to be used as a web browser per Microsoft. I wouldn't be surprised if they'll eventually remove IE 11 out of Windows once Edge Chromium goes into Stable release or after a release or two for people to transition over. Especially with IE mode going to be built into Edge C. Although Maybe not and they'll keep IE 11 in Windows, but Edge Classic will be gone.