Yeah, but atleast in Svelte it's explicit, and you can if you wish write svelte as if ste were immutable. Anecdotal, but still, I've had fewer bugs (particularly wierd UI glitches) in Svelte than I ever did in React. I just like Svelte for the types of project I work on.

Tangent: the idea that "we all agreed to say no thanks to that" is kind of symptomatic of broader issues I have with web dev. i.e. that there's very little recognition that different tools have different uses and knowing when to pick which is part of the job. Working with wood you wouldn't apply the same practices and methods to building the timber frame of 2 story house as you would to making an intricately carved toy elephant. Why when working with the materials of the web, HTML/CSS/JS, do we assume there's a best and right why to do it: "you must write tests!", "avoid using z-index!", "separate content and form", "immutable state!"; these are all the right answer in some situation and not in others.