I'm also in the "still using Yarn 1.x" camp. The problem is that yarn is installed to the global path by a package manager from outside the Javascript ecosystem, which means that the same install of yarn is shared between all the projects I might run on my system, including projects I don't maintain myself and including projects that aren't maintained at all. I'm open to other JS package managers if they offer benefits, but the one that runs when I type "yarn" in my shell has to be backwards-compatible with 1.x, forever. Repositories like Debian/apt-get and homebrew operate on a similar philosophy, and still offer only 1.x.

So... why didn't they just put a package-manager version number in package.json? I would have no problem with projects requiring Yarn 2+, if upgrading to Yarn 2+ didn't create an obstacle to continuing to run everything else that still uses Yarn 1. As it is now, I'm not willing to even _try_ the newer versions, because I expect to have to revert and I'm worried that I'll lose a day to the mess that the uninstall/revert will create.