If you're using an editor to automatically pair your parens/brackets/braces/quotes, you now have to find and navigate to the end of the expression, which could

If you're using an editor to automatically pair your parens/brackets/braces/quotes, you now have to find and navigate to the end of the expression, which could be lines away if you're creating objects and arrays, or calling functions with complex arguments. When coding, my cursor is rarely just "at the end of a statement" on its own. The only way it typically gets there is by me intentionally placing it there. Refactoring is a bigger hassle as well. You may want to use the return of your statement as an argument to some new function. Now the semi has to be removed and added elsewhere. It's not the end of the world, but it's a hassle.