I plan to make my next YouTube video making my case for why Laravel is better with Svelte than SvelteKit is https://youtube.com/@samldev
The whole point of it is it bridges the backend you know (Laravel, Rails, Django) with frontends (React, etc), without having to mess with JSON APIs.
The lack of a clear leader Rails clone in NodeJS land is probably the ecosystem’s biggest weakness. The downstream effect is theres a bunch of typical libraries/clients are just… MIA in the node ecosystem. Like, there’s no production grade Memcached client for node. ¯\_(ツ)_/¯ We had to fork one & heavily patch it for Notion.
Honestly, the upside of 1 language is not that high. Don't be afraid of PHP, it isn't the same language it was 15 years ago. I've been programming JS for 10 years but only been using PHP for a year, it's weird but it's got some nice parts too.
It basically gives you access to the entirety of features provided by Rails, Laravel, etc without having to write an API, create a separate codebase or deployment. You don't get any of that with SvelteKit. This is apples vs oranges.