[2cynykyl]

From what I can tell, Quarto is essentially an installer for Knitr/R, that also comes with a bunch of goodies, like when working in VSC (or Rstudio) it auto-suggests cross-references to content in the document, like figures/chapters/equations/etc. It also has a github action that builds and deploys the site in like 1 one line. Just removing the friction and lowering the bar is very helpful sometimes.

[hadley]

That's true, but quarto also has full support for Python and Jupyter notebooks, not to mention julia, and observable. It's really built from the ground up to be multi-language so that everyone can benefit from all the goodies in RMarkdown.