I don't think the OP was trying to say that server-side validation shouldn't occur. That being said, your statement makes me think that you are overlooking an

I don't think the OP was trying to say that server-side validation shouldn't occur. That being said, your statement makes me think that you are overlooking an important aspect of client-side validation: instant feedback for the user. It's not necessarily just about saving bandwidth and server resources, but providing a clean and responsive user interface.