> a lot of tasks were not worth the trouble of ensuring correctness, and so dynamic languages too over.

I'm not sure about this ... to me it seems the dominant effects were firstly that Javascript is the only language allowed in browsers, and secondarily that nobody had really cracked the usability issues to give us a language that had type-safety and no explicit precompile phase and easy integration with the webserver.

(It doesn't help that a lot of experienced developers are either actively hostile to the concept of developer-usability, or think that their own idiosyncratic habits are the definition of usable and cannot be improved!)

People instead moved their correctness work to unit-testing.