Saying Go is better than R at things R isn’t used for is a joke because it’s obvious and someone doing this in R would just draw the question of why even though they could
Did you mean 1MB? With correct settings, you get under 1MB Rust binaries and with even more compression using upx it gets to 300KB, probably less for much simpler applications. Rust applications aren't that big of a deal as people make it to be; within reasons off course.
The one issue I have with Rust apps is how much memory they need to compile (depending on the app ofc). I could not install Pika Backup from AUR on a laptop with 4 GB of RAM for instance because the compilation would run out of memory. It's one case where I was glad flatpak is an option.