On the "if we were to design a programming language" level, it seems that a feature like ASI (Automatic Semicolon Insertion) is not only useless but even harmful. Every programmer is required to learn the rules of the mechanism in order to understand others' code. Furthermore, it needlessly increases the amount of possible programming styles, which, in my opinion, is a bad thing.

C programmers have always used semicolons and never wasted a second thinking whether they should.