I think Vim and Neovim is better suited as editors, meaning quick launch, fast localization of files and fast editing actions. And I like plugins that support this philosophy.

But the goals with emacs is to be a complete platform for anything plain text (with a bit of extra widgets). Almost whatever you need the terminal for can be replicated there, and they will share some common convention. Mail, file manager, music players, feed readers, PKM, PIM,… Tect editing is not so great, but text actions are (Slime is the best example).

I use both, but I prefer emacs’ extensibility.

Yes Emacs is still a better platform for building applications on for sure. Emacs lisp is a better language than Lua although harder to learn.

I used Emacs with evil mode for years until switching to neovim last year. It was really great.