Going back to Mandrake/Mandriva days we have had task packages that are meta packages. The only function of these packages is to install a group of packages needed to perform a specific task. The task-plasma6-x11 package only has the function to pull in all those other package needed for X11 to work on a Plasma6 system.
All that is needed for a Plasma6 Wayland installation to use X11 is sudo dnf in task-plasma6-x11 --refresh. The other packages are by design installed with the meta package task-plasma6-x11 this is what this package is for.
As a tester I do this on any hardware Plasma6 Wayland system. task-plasma6-x11 is in my post install list for Plasma6 Wayland systems and task-plasma6-wayland is likewise in my post install list for Plasma6 X11 systems. This is so I can test how things are working in one vs. the other.
In other words I do this a lot.
Edit: There may be special use situations needing something else. People in special use situations should know if they need some other software and how to deal with that.
Second-edit: Once user has both Wayland and X11 to switch between the 2, logout and in lower left corner of SDDM login screen you can select “Plasma (X11)” or “Plasma (Wayland)”. Also if user is using autologin you can select which to use in SystemSettings>Colors & Themes>Login Screen (SDDM)>Behavior.