Fennel is a better Lisp than elisp. Neovim is extensible, and to a large degree written in, Lua, which the target language of Fennel.
Most developers do not like writing Lisp. That's just a fact, slamming the downvote button won't change it. I am not among those developers, I like writing Lisp, but most, flatly put, do not.
So by choosing Scheme you are competing with a remarkable number of little-used editors which can be extended in Scheme or Common Lisp, as well as Emacs, far and away the top dog in the extensible-in-Lisp-editor niche. Neovim has achieved the best of both worlds, because it can be extended in a rather nice Lisp, and also in Lua, which, while some find the quirks of the language annoying, is at least Algolic in structure, matching the mode of thinking and writing used by the vast majority of devs.
No it has not. Fennel doesn't have the same level of integration into Neovim, like Elisp has in Emacs. Emacs is essentially a Lisp interpreter with a text editor built on top of it. This tight coupling allows Elisp to interact with and modify every aspect of Emacs, providing a level of customization and extensibility that is difficult to replicate with external languages.
While Neovim's approach with Lua and Fennel is commendable, it is unlikely that these languages will achieve the same level of seamless integration as Elisp within Emacs.
Most developers do not like writing Lisp. That's just a fact, slamming the downvote button won't change it. I am not among those developers, I like writing Lisp, but most, flatly put, do not.
So by choosing Scheme you are competing with a remarkable number of little-used editors which can be extended in Scheme or Common Lisp, as well as Emacs, far and away the top dog in the extensible-in-Lisp-editor niche. Neovim has achieved the best of both worlds, because it can be extended in a rather nice Lisp, and also in Lua, which, while some find the quirks of the language annoying, is at least Algolic in structure, matching the mode of thinking and writing used by the vast majority of devs.