I recently received a new Rifle Basix Sav-2 trigger, and proceeded to install it on an action yesterday. While watching the install video, it seems to (very briefly) imply that I am supposed to modify the factory sear to remove the sharp edge. This portion of the video is so brief (simply a before and after photo) that I'm a little confused on what I'm actually supposed to do here. So, my questions are:

1- Am I supposed to modify the factory sear?
2- If so, what is the purpose of altering the shape of the sear, and what is the end goal?
3- What if I don't alter it? I haven't as of yet, and it seams to be working just fine.

Thanks in advance.