JavaScript/Jquery and R programming

Hi Experts here,

Need your advice here.
I see it’s always better to use JavaScript/Jquery on the UI file rather than using R programming on the server side? Correct?

Reason being JS speeds up the app compared to R is what I understand. Correct?

For example,
We can use Onclick function on the UI side and the same time, we can use observeEvent on the server side.

Which is better?

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