With the way callbacks work in Javascript and jQuery, you lose some flexibility in organizing your code. It is true the types in Javascript make it difficult to build large projects. These drawbacks can be overcome, of course, but this is all orthogonal to the main point......

If Javascript and jQuery truly are bad (though I would claim they are not, they are mediocre but workable), it's because their creators didn't know history, not because the problem is unsolvable.