I know what the difference is between LET and LET*. What you haven't provided is a motivation for forcing the programmer to worry about that. It seems there's no concrete example of where unstarred LET would be better. If a programmer ever falls in the habit of sometimes using unstarred LET, then it's likely he'll make a mistake by using it where starred LET* was the right thing.

Even Scheme gives this distinction an odd prominence that's not found outside the Lisp family. It seems reasonable that when I write code, I shouldn't have to stop and worry about which of the gazillion different LET forms is appropriate, especially in a high-level language which is supposed to help me write code (or read code) without worrying about irrelevant details like that.