Positron inherits many ideas from RStudio, but is a separate project with an intentionally different set of tradeoffs; it gains multi-language/multi-session support, better configuration/extensibility, etc. but at the expense of RStudio's simplicity and support for many R-only workflows.

We're still investing in RStudio and while the products have some overlap there's no attempt to convert people from one to the other.

(I work at Posit on both of these products)