Hosting the images directly on the lemmy/kbin instance creates imo unnecessary traffic to the servers. I don’t know if admins can disable selfhosting images, but considering the low-powered machines almost every instance is currently hosted on, I would assume it would be in everyones self-interest to outsource image hosting (at least for now).
You have to install them manually, but it’s pretty easy thanks to yast and zypper.
I found it way easier compared to arch or even manjaro.