For React, I agree with the complaints. The change from class components to functional components and the addition of hooks for we was a step backwards.
As for vue, most of my experience is with vue 2, never really spent a lot of time with the features of vue 3.
To the the some of the syntax of svelte makes more sense than that of vue. For example, to list something in vue an html with v-for is needed, or . This always felt a little awkward to me. In svelte you iterate on the data, not on an html element. So you have an array and just put {#each item i items} ... {/each}, not need for extra html or pseudo
I also prefer svelte's computed properties to vue's.
All it takes is a $: value = a + b and from there whenever a or b changes value also changes. Sometimes my computed property on vue will start growing a little too much.
Something similar in vue and svelte that I enjoy a lot is that the code is separated from the html and from the style. Some people are fans of JSX but I can't stand it! It allows me to shoot myself in the feet and I do it way too often.
The store is VERY VERY nice too! it's lighter than vuex but seems to have some of the limitations that redux/mobx have, say, it has to be functional. I haven't had to write any reducers like with redux tho, but stuff like [].push() won't update.
Overall I really really like it because it's almost transparent. I really didn't have to "learn" svelte as I had to vue or react. It was similar enough to HTML/CSS/JS that it took no time picking it up.
But, that's just me