>But this does fall apart for very very large grids, as you get close to the height limit described in this article.

This was solved by a now unmaintained virtualization library that predates both of these libraries: https://github.com/bvaughn/react-virtualized

The react-virtualized library works around this issue by scaling the the scroll position it sets for a row based on the ratio of "max CSS height allowed by browser" to "computed height of all rows" if the latter is greater than the former: https://github.com/bvaughn/react-virtualized/blob/master/sou...