"Why should I care?" would be a start
from what I know it's "in development" compared to Xorg
from my understandings:
xorg is just old and it's a patch over patch over s'more patches - old & unreliable.
doesn't support "new" stuff, like my triple setup, and I'm sure other things.
to get it working, i went through so many configs and guides and tutorials, dozens of dotfiles I found on reddit and github, over months of frustration - and not a single one worked.
my absolute first boot from a clean archinstall, after installing hyprland and a handful of packages - it just freaking worked!
i didn't have to config anything 
so i'm sticking with it.
and I'm not one to "like" unnecessary ricing, like colored borders and shadows and animations. i have always liked how minimal bspwm was, and i3 and dwm. those were the tilers I had used in the past.
everytime I saw someones "rice" on /r/unixporn, I always scrolled past those that did not appeal to my "minimal preference" ๐คฃ
but here i am with the most minimal config I have ever configged, animations & shadows on my windows, bwahahaha.
and it just works.