I keep seeing new projects that implement things that Emacs and Org mode already do incredibly well. I guess it's a testament to how steep the Emacs learning curve is, or perhaps how ugly the defaults look.
You have ox-beamer, which lets you write your slides in Org-mode, and export using LaTeX and Beamer, which look pretty great. You can also use org-reveal, or org-re-reveal to make some visually very attractive presentations with reveal-js. And finally, if you want to actually have the presentation run inside Emacs, you can use dslide[0] which looks really nice, and leans heavily on org-babel.
Steep learning curve and it's sorta an all or nothing investment. I don't particularly care for emacs despite having tried several times in earnest. IMO a tool that requires full (or at least significant) buy-in on an ecosystem isn't a great tool and warrants an alternative. I'd rather see good agnostic tools get made and then wrapped.
There's definitely something to be said about emacs being stuck in time. However, everything under the sun is just a half-baked clone of something emacs already had, except for text-editing :^)
You have ox-beamer, which lets you write your slides in Org-mode, and export using LaTeX and Beamer, which look pretty great. You can also use org-reveal, or org-re-reveal to make some visually very attractive presentations with reveal-js. And finally, if you want to actually have the presentation run inside Emacs, you can use dslide[0] which looks really nice, and leans heavily on org-babel.
[0]: https://github.com/positron-solutions/dslide