I'm confused by this statement because AOT compilation is an option, and it's getting better over time.

https://julialang.github.io/PackageCompiler.jl/stable/sysima...

In Julia 1.9 and beyond, this process now also becomes modular with a native library being produced per package.

The difficulty is determining what exactly must be compiled since Julia's methods are polymorphic. There's are tools that exist to help with this. One of the latest that is SnoopPrecompile.jl.