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Have to use? No one has to use any library. It’s convenience, and in this case it’s literally so they don’t have to write code for older browser versions.
The issue here isn’t that anyone has to use it, it’s the way it was used that is the problem. Directly linking to the current version of the code hosted by a third party instead of hosting a copy yourself.
Looking directly at the sun for short periods of time doesn’t immediately cause problems, but years down the line you will start to notice a section of your vision start to become like a void, no color, no light, just a lack of sight.
Just because you don’t notice an immediate effect doesn’t mean you’re not causing harm. The human body is a wonder of redundancy, and having ways of compensating in the short term. But eventually those compensations start to fade.