Why is it a mistake to overuse exclamation points in your writing?

Anytime you use more than one exclamation point or question mark it is known to be very improper do to you already knowing that it's a question or a loud remark

Exclamation points are used to exclaim emotional remarks. So when you overuse the exclamation mark it comes off as exaggerative and unproper. It is best you only use an exclamation point when absolutely needed in formal writing. I try to avoid them all together.