Ultimately, you're right that `rv` and `renv` get you to the same spot, both create reproducible, isolated projects. `renv` has a few issues that we often hit that lead to `rv`.

`renv` is an iterative process of installing some packages, then snapshotting your project state, and then trying to reproduce. The time between the installation and snapshot can often lose information (think `install.packages("my_pkg", repos = "https://my-repo.com")`, your repo source is lost by time the snapshot occurs). You can also install incompatible versions over-time.

rv solves both of these problems because it will lock the source at the time of installation. Additionally, because it is declarative, we are able to resolve the full dependency tree before installing packages to ensure everything will be compatible.

While I am a big proponent of using rv, if renv fits your needs, then switching to rv may not be worth it. For our organization, we did have multiple issues with renv, so created a replacement for it that we hope others in the community will find useful to address their needs.

Tend to agree. Majority of users are leaving that icky computer stuff to RStudio and have no idea what happens behind the scenes.

Mise is pretty new, and it's userbase is tiny (afaik), so the overlap with it and anything is tiny. But I've enjoyed it as a replacement for ruby/node/java/python version managers, and I think it's a solid, thoughtful piece of kit. I think it targets curious, multilingual hackers who I imagine would be the kind of people to try out R to "kick the tires" just for fun (I imagine Elixer, Erlang, and Zig are in there for the same reason...surprised not to see Julia). It's also the case that mise is already doing all the heavy lifting of documentation, website, installation, etc so might as well not reinvent the wheel (such projects always have far more scope than you think, in my experience!) It could free you to making the package manager that much better (a very hard problem in itself).

I'm not affiliated, btw, just a happy user. Shout out to DHH for introducing it (to me) as part of Omakub.