[umvi]

Iteration cycle of strongly typed languages can be very short too, if you pick the right technologies. Rust (and c++), unfortunately, has pretty long compile times compared to, say, Go.

The problem with loosely typed languages is that you don't find out until runtime that you have a problem. And if the problem is inside an if statement that users only hit 1% of the time, you might not find it at all except in the form of users very occasionally complaining that it sometimes crashes unexpectedly.