In my opinion, there is no such thing as a "general application". What about generating static websites? Is that a "general application"? Is TTFX a big issue there? Currently, the Julia package Franklin.jl takes around 15 seconds to create the website the first time (changes in the source code update the page in less than one second). I'd argue no.

What about Julia to produce generative art? Is TTFX an issue there? Etc. If "general applications" means _all possible applications_, then I'm not sure any language is suitable for general applications.

Julia has weaknesses which limits what it's good at. Right now I think it has more weaknesses than other languages. Some of these limits will hopefully be removed or reduced in the future. But fundamentally, I don't see Julia as some kind of domain specific or niche language. Just like any language, it just has its own set of tradeoffs.