For example, I'm using Debian, and I think we could learn a thing or two from Mint about how to make it "friendlier" for new users. I often see Mint recommended to new users, but rarely Debian, which has a goal to be "the universal operating system".
I also think we could learn website design from.. looks at notes ..everyone else.
Not my current distro but I love ChimeraLinux, they manage to put musl and BSD userland into a working wonderful distro. I wish more distros adopted musl.