well the library ecosystem, developer tooling, and gradual typing support for lua is far ahead of what’s available for vimscript. in my experience lua is #2 behind javascript/typescript’s #1 when it comes to scripting language LSP stuff. both python and ruby suffer from a profusion of alternative type checkers and whatnot that cause pain and fragmentation when it comes to tooling.

it’s pretty great to have my vimconfig give red squiggle in editor if i’m doing it wrong before i save & reload.

but i’ve not followed vim9 script as its evolved perhaps there’s a good type checker for it at this point?

even before neovim, there were vim extensions written in lua so it feels gravity of lua code has been considerable for a long time.

to me vim9script feels like perl5/raku split - evolution too late to grow new users, a remnant for a niche that will fade to oblivion slowly over the next 10 years.