Huge update - 1897 packages - how come?

Difficult to have an opinion on - it varies greatly from member to member.

You could get enlightened by running a few commands

pamac list --orphans

And

pamac list --foreign

EDIT

Plasma Wayland comes before Plasma X11 and the filenames change so sddm will list the available sessions in alphabetic order - and since you didn’t change the session selection box - the first session is used - sddm always worked that way.