Well it helps that the iteration loop on the FE is generally really fast, so type errors are really quick to debug. You rarely even have to run a test suite, j

Well it helps that the iteration loop on the FE is generally really fast, so type errors are really quick to debug. You rarely even have to run a test suite, just load the page on a local node instance, get an error, print the object, refresh, takes 10 seconds. For BE code it can take 10 minutes to hours to deploy with debug info, so type errors are a huge PITA and strong types are critical.