TinyTeX is a custom LaTeX distribution based on TeX Live that is small in size (about 61Mb on macOS/Linux, and 94Mb on Windows when (g)zipped), but functions well in most cases, especially for R users. If you run into the problem of missing LaTeX packages, it should be super clear to you what you need to do (in fact, R users won’t need to do anything). You only install LaTeX packages you actually need.