* document classes. Creating document classes is too difficult with LaTeX and a new document class with finl will be a relatively trivial thing to create,
* extensions to LaTeX to remedy deficiencies. Some, like babel/polyglossia and the six million improvements on tabular would be things baked into the core format of finl. The most notable third-party ecosystem that would be translated would be the whole TikZ environment. I'm aiming to be able to allow TikZ illustrations to be cut and pasted into finl and to replicate at least the most common extensions. The other big one is the whole beamer ecosystem. The finl equivalent will keep similar if not identical syntax but will be superior in that it will be able to allow non-PDF backends for output (so, for example, one could run finl-ppt mypresentation.finl and get a PowerPoint presentation with all the capabilities that PowerPoint gives for things like animations and transitions that are difficult or impossible to achieve in a PDF-based presentation.
I don't know if you are aware, but finl has been also submitted to Lobsters (https://lobste.rs/s/udu5oe/finl_is_not_latex_reinventing_lat...). One of the comments mentions SILE (https://sile-typesetter.org/). I looked into it (https://www.youtube.com/watch?v=5BIP_N9qQm4 was nice introduction, although I don't know how up to date it is). It seems to me that SILE replaces many pain points in TeX, while being somewhat close to LuaTeX (and TeX in general), due to use of similiar components (Lua, alogorithms, hyphenation patters, libraries). It even supports "LaTeX" like input syntax, but frankly I don't think that is the part of LaTeX I would keep :).
Can you share your opinion on SILE?
Is it better than markdown, as laid out by my browser and the free pluggin, and saved to pdf? Not from those examples.