[sph]

Why switch? Is it that weird to know and use more than a language?

In case of adoption, both answers are yes, because Rust and Nim don't occupy the same niche. The reason why Nim has not caught like wildfire is that its niche is often shared with Python or Go, which have a much larger mind share.

Which is why asking this question from the memory safety point of view misses the mark.

[jasonjmcghee]

It is not. I use 3 languages on a weekly basis for work, and 2 more for hobby stuff.

It's about use cases- frontend, jvm, systems/low-level, realtime/sockets, ML. There could be more overlap, but for reasons they don't.