> Of course this still does not mean that people will want to learn yet another scripting language

I understand this sentiment and that there are certainly psychological blockers in having to learn too many languages, but vim9 is very simple to learn. It is much closer to a "familiar" language than Lua. Plus, you are going to have to be familiar with Vim's standard library anyway. I believe they are adding more and more helper functions but Lua plugins are full of `vim.cmd` and `vim.fn`. I don't dislike Lua as a language at all, but I much prefer "scripting Vim" in some sort of "VimScript" :) But to each their own.