For those who are old enough to remember dial up internet, progressive JPEGs were super popular in the 90’s, especially because we were dealing with slow internet connections. The main reason why we would use them today is to improve performance for those on slower connections such as mobile or in rural areas.
Every now and then, a debate flares up about the value of typed JavaScript. "Just write more tests!" yell some opponents. "Replace unit tests with types!" scream others.