I checked NEWS 4.0 and updated R from 3.6.3 to 4.0 and Rstudio to 1.2.5042.
There's no critical issue yet in their mention at least.
and Running R doesn't have problem yet.
but some library have problem and it's hard to distinguish whether that problem is from Rstudio or that library.
so I think it depends on what do you want or use.