I always say Mithril is a sushi chef knife. It's wonderful if you know what you're doing, but you can cut yourself badly if you don't.

In more popular frameworks like React, Vue, and Angular, there are multiple tools that give you a structure. In Mithril you're free to do whatever you want.

Personally, I love that freedom. It's also one of the reasons I love Svelte, since it tends to get out of the way.