Reewriting is a process of generating a lot of information by writing non-stop for a predetermined amount of time. It allows you to focus on a specific topic, but forces you to write so quickly that you are unable to edit any of your ideas.

The information provided is quite apt. What remains is to further look at other merits and de-merits and actually do a freewriting example under the explanation section of this answer.

One paragraph will be free-written whilst the other paragraph will be a refined version of the free-written text.

Explanation:

Merits:

As already indicated, one of the merits of freewriting is that allows the writer to focus on a specific topic whilst writing very quickly.
Another merit is that it helps to overcome the "writers block" which is a situation where the writer is unable to start writing for fear that the work will not come out well or creatively.
So it helps the writer garner confidence
It focuses on getting the job done not necessarily the quality of the work. This can be an advantage if getting the work is a challenge in the first place
when writers free-write, they are not trying to embellish ideas thus making their work authentic

De-Merits:

The first de-merits I'd like to state is that the process does not necessarily help the outcome of the work. This is a disadvantage where the quality of the work is the focus rather than getting the work started.
It's like writing without any focus. This means the writer can eventually end up with no clear direction on their work
It can be very difficult initially especially when compared to Outlining as an alternative technique.

A Freewriting Practice:

So this part of the answer is where I get to test my ability to freewrite. We have examined some pros and cons of freewriting. My take is that it is useful to know and combine more than one technique of writing. For instance, outlining as a method can be combined with freewriting to produce exceptional results.

How? it is possible to have an outline but still have a writer's block. In this case, the freewriting technique helps to unlock one's creativity but without the disadvantage of goalessness given that there is already an outline.

So this is where I think it is safe to stop typing.

Thank you.