In the age of AI, it's all about popularity contest unfortunately. More people use it, more data points, more training data to feed, better AI response, more people use it.

Svelte shot itself in the foot with runes and other incompatible (but minor) syntax changes. Bad timing. Because now whenever I ask any AI, they will suggest old syntax that doesn't compile.

I just say "use svelte 5 stuff only" and I get only the new things.

>Because now whenever I ask any AI, they will suggest old syntax that doesn't compile.

That's an AI problem, not a Svelte program. This happens for any lib which happens to change, not just front-end contenders. (and oh do they change, especially niche vendor sdks!)