As we know "Dynamic layouts arrange items in a flexible form, automatically adjusting to screen size. When the layout width exceeds the width of the screen, a dynamic layout responds by wrapping controls to the next line."
then why do we need responsive breakpoints in dynamic layout?
I'm at the learning stage now. Preparing for SAE.
***Edited by Moderator Marissa to update Platform Capability tags****
Dynamic Layouts are responsive in nature by default based on screen size. but these breakpoints are defined with certain screesize by default. If you want to change those behaviour, you can add your own breakpoints, so that it will be responsive in the way that you define it.