I'm not objecting categorically to anything. I think that immutable infrastructure is a spectrum, and depending on your needs you may have just about everything immutably configured, or almost nothing. I just don't think it's so black and white as "you should always use immutable infrastructure."
I also think it's a cool idea to destroy the entire cluster just to add a node, and it sounds ridiculous but also like there's some circumstances where it makes perfect sense.
Again, do you have a citation for the notion that it's a spectrum? The original post that coined the term doesn't talk about it that way, and neither do the other resources I found in a quick search. As I see it, it's binary: when you need to change something on a server, you either tinker with the existing server or you replace the server with a fresh-built one that conforms to the new desire.
I also think it's a cool idea to destroy the entire cluster just to add a node, and it sounds ridiculous but also like there's some circumstances where it makes perfect sense.