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.
Everything from each other. Almost no distro will ever be extremely effective at doing anything that is literally impossible on any other distro.
You might like vanilla then. It has containers for each distro, I’m pretty sure.