Remove Log Fields - why?

Hi everyone!

I have a question about log filed customization.

Why does every source suggest to:

Add Log Fields
Write Log
Remove Log Fields

I don’t get the remove log fields part. I mean ok we write the data into logs but why remove them afterwards?

Is it only that when you have the logging process in a loop that you should add > remove the fields? Here it would make sense to me since we would stack the same logs over and over again.