I would just like to point out that I have used numerous privacy extensions for firefox ever since I started using it. I've happily found WebExtensions replacements for all of them except for HTTPS Everywhere, which AFAIK is developing a WE replacement.

For me, the WebExtension transition isn't all doom and gloom. But I can't assume everyone uses the same addons as me. The transition to WebExtensions is nearing and a lot of extensions people use just don't have a viable replacement.