There are domains where "end users care about data mutational elegance" because, you know what, they care about reliability in a very strong way (not like: hey

There are domains where "end users care about data mutational elegance" because, you know what, they care about reliability in a very strong way (not like: hey the web site is down, let's call the devs; more like: there was a bug, let's call the morgue). Just to say. But I agree with you: if your work balance is more oriented towards productivity then rust will not help much. For example, I design lots of stuff in python/jupyter/ecosystem first and then port that to rust for the speed and correctness.