I think this is reasonable. Plasma 6 recently appeared in Debian Experimental, Qt 6 is already in the Stable branch, and a new Debian release seems likely in t

I think this is reasonable. Plasma 6 recently appeared in Debian Experimental, Qt 6 is already in the Stable branch, and a new Debian release seems likely in the coming year. I expect the folks managing Ubuntu just want to make sure their non-Debian stuff is ready for the upstream change.