Issue: Lack of option to choose display server protocol (X11, Wayland, or both) for all supported desktop environments and compositors during archinstall

When using archinstall to install desktop environments and window managers/compositors that may support X11, Wayland, or both (for example, KDE Plasma supports both X11 and Wayland, Hyprland supports Wayland only, and others may support X11 only or both), there is currently no option for users to select which display server protocol(s) to install and use.

This leads to cases where only Wayland sessions are installed without necessary X11 packages, or vice versa, depending on the default configuration, which causes the display manager (e.g., SDDM) to only show limited session options. For example, if only Wayland is installed, X11 sessions won't appear in the login screen.

Consequences:

• Users cannot explicitly choose the protocol(s) that suit their hardware or software needs.
• Some display server protocols might be missing post-installation, limiting user choice.
• Lack of clear guidance on adding support for missing protocols after installation.
• Reduced flexibility and clarity in installation experience, especially for new or less technical users.

Proposal:

Add an option in archinstall’s setup process that lets users choose for each desktop environment or compositor:

• X11 only
• Wayland only
• Or both (if supported)

This would ensure that the correct packages and session files are installed for the chosen protocol(s), enabling the display manager to list all available sessions accordingly and greatly improve user experience and flexibility.

Thank you for your continued work on archinstall. I hope this suggestion is considered to improve usability and user empowerment.