"The writer has the gift of time and the plasticity of her tools.
Hate a sentence, a character, a plot device? The delete button is your friend!
There's great joy in being able to erase/delete mistakes in a piece of writing.
Aren't we writers lucky to have such a malleable art form!"
It's like knitting.
You have to go back and forth, building the thing up.
But if you don't like it, it's easy enough to drop down and fix something, or even disassemble the whole thing and reuse the parts.