Purpose of a Blank Subevent (vs. a "non-blank" subevent"

I can't seem to find why one would use a blank subevent vs a "regular" subevent.

Yes, I'm a newbie.

Useful for breaking up code. I use blank events all the time.

Also sometimes you need sub-events to run then right after you need some common code to run, so you use a blank to place the code after the sub-events and then run the common code.

Ex;

Some_condition

--> Sub_one: action one

--> Sub_two: action two

--> Blank: action for both cases

BH - Thanks much for the first part and MUCH THANKS for the second - I was trying to figure how to incorporate sub-conditions in between common code.