In fact they should try other methods which could increase their productivity and overall enjoyment of writing. There are the plotters who plot from beginning to end before they write a single page. This method is great if you don't mind writing the story more than once. After all, if you plot the entire story, have you not written the story or created the story completely at that point? To me this boxes me in. I wrote it in the plot, nothing else needs to be added, so now my writing becomes a chore, a copy of the plot. This does work great for a lot of writers.
Edit as you go writers will write a few pages and edit them before moving onto more pages. This is great if you can write first then edit. Far too many writers fall into the trap of trying to edit while they write and this can cause writers block. Trying to get your left and right side brain to work in unison that way is tedious and can cause great frustration. So be aware of this.
Seat of the pants writers get the idea in their head, they have their main character in their head and they write from beginning to end before they edit. Although this method is quite liberating because there is no "written in stone" plot to follow and they don't worry about the editing till its done. The downfall is this method usually requires more editing when finished, greater expansion on characters and holes the size of the moon. This method is great for those who do not edit their own work or enjoy editing themselves. There are a great many famous writers who use this method.
Lastly there is the hybrid method. A method I chose to use (created it for myself) because it incorporates the freedom of seat of the pants and plotting. I like to do a general plot. Not too expansive just the idea itself with some characters I know I will use. I flesh out the characters themselves. Give each a page of questions to get an idea of their personalities. So they are detailed, but not the story.
Then I allow my characters to do what they would do. I place road blocks and twists and turns in their path, and let them do what they would do in that situation. This seat of the pants method does not require as much editing as the aforementioned one above because you know your characters already, they do what they would do. This allows me to be creative, see the story for the first time as it happens (which is great fun to me) and on occasion, I surprise myself with great satisfaction of a well written story.
So there you have it. Several methods. You don't have to pick just one, you can mix and match as I did, but you should try each of them. Find which works best for you and go from there. It really couldn't hurt to try and you could end up with a new method that works one hundred times better than your current one.