Why is R not supported in Unity Catalog shared access mode?

[johnmn]

As written here: Compute access mode limitations for Unity Catalog | Databricks on AWS

Why is R language not supported? 

[MuthuLakshmi]

@johnmn 
Please find below the reason for why R is not supported?

R is currently not supported in Shared clusters due to the specific limitations and configurations of these clusters. However, Databricks has recognized this gap and has plans to support R workloads on Shared clusters in the future. The timeline for this support is not yet defined.

We are not dropping R support, and R will be supported on Shared clusters as well. 
We do have a feature request raised for this: DB-I-7350

[HamishSpalding]

Is there any update on when the timeline will come out? I am unable to use a shared cluster at work because shared computes do not have R as a supported language. Thanks