Chaotic is midcore, in case you were wondering

[Hallarem]

Bozja is casual content. Have you ever asked someone if they want to go to Bozja and they've said "nah, that's too hardcore for me"? No? That's because it isn't halfway between casual content and hardcore content. It's just casual content.

Someone clears ultimate on the first try. Its casual content. Someone thinks ultimate is easy, its casual content.

It can mean pretty much anything you want it to mean. Same with midcore.
You define it on your own.
For ME its engaging content that isnt braindead nor something that requires you to invest yourself in a 100% in a pressure situation. With a few more additions.