Very good explanation.

Remind me the deadly heat wave told in the book The Ministry for the Future when the whole town go to the lake to find freshness and only found jacuzzi conditions

At the time computers were totally useless for everyone but big firms, banks and military. Ads for computers were rare and confined in specialized magazines. For mundane people, computers started to be actually useful (like money earning useful) 20 years latter at least. That’s how I understand your approximative comparison

I’ve seen code in my workplace using parseInt to round JS Number. Made me cringe coming from system programing but I didn’t see the danger.

It’s sad the only way to prevent such a bad code in production is to use transpilers.