Every immutable distro right now

https://lemmy.ml/post/28735640

Every immutable distro right now - Lemmy

What’s the difference? No matter how hard I look, most of their websites just consist of them advertising that they are immutable.

Okay, I get what an immutable distro is. I get it’s advantages in security/safety. But can someone please explain why this matters? Like, how much safer is this really? I don’t understand the cost/benefit ratio of having an immutable core, especially since compromising the core will probably require fully compromising one or more privileged processes first, at which point it would be game over for a mutable distro as well.
Preventing supply chain attacks for one.