It would be great if R could be used to analyze Hail Matrix tables. That would have a couple benefits:
1. Allow the use of many R and bio conductor packages available on hail tables and matrix tables.
2. Provide R users an ability to scale their analysis with Hail.
Sparklyr now allows reading Spark Dataframes and there is an ability to add extensions that may be useful to use for Hail matrix tables.
https://spark.rstudio.com/
https://spark.rstudio.com/extensions/