You're reading a large chunk of code when you realize....Oh, this part does this and then that part does that. Stop and put a blank line between the parts.
This tidying is very, very simple. The philosophy of Tidy First is to not make software design such a big deal that we are in danger of not doing it. A little software design can make change a little easier.
Compound Interest
Software design also makes more software design easier. Done well, software design enables software design that enables change.