I think with the Steam Deck being based on Arch, Valve recommending Manjaro as a Desktop Distro, and Microsoft having more frequent updates to Windows, Canonica

I think with the Steam Deck being based on Arch, Valve recommending Manjaro as a Desktop Distro, and Microsoft having more frequent updates to Windows, Canonical has probably seen the shift in popularity towards more rolling release style distros/frequent updates and wants a piece of the pie.